The document provides an introduction to Unix concepts including:
1. It describes the architecture of Unix as having 4 layers - hardware, kernel, shell commands, and application layer. The kernel interacts with hardware and manages tasks like memory and process scheduling.
2. It lists some basic Unix commands like ls, echo, printf, who, date, passwd, cal and explains how to combine commands using operators like && and ||.
3. It explains Unix files and directories are organized in a hierarchical tree structure with the root directory at the top. There are different types of files like ordinary, special, pipes and symbolic links.
The document outlines the 14 steps to install Red Hat Enterprise Linux (RHEL) through a graphical user interface (GUI). The steps include inserting the RHEL DVD, selecting the language, partitioning disks to create mounts for /boot, /home, and swap, setting the root password, and initiating installation. After installation, 9 post-installation configuration steps are described to accept licenses, configure firewall settings, SELinux, sound devices, and more.
The document provides an overview of the UNIX operating system. It discusses the history and development of UNIX from the 1960s onward. It describes the key features of UNIX including its layered architecture, kernel, shell, process management, file system, and security features. It also covers basic UNIX commands for working with files and directories, permissions, and getting help. The objective is to introduce readers to fundamental concepts of the UNIX OS.
The document provides an overview of the UNIX operating system. It discusses the components of a computer system including hardware, operating system, utilities, and application programs. It then defines the operating system as a program that acts as an interface between the user and computer hardware. The document outlines the goals of an operating system and provides a brief history of the development of UNIX from Multics. It also describes some key concepts of UNIX including the kernel, shell, files, directories, and multi-user capabilities.
The document summarizes the architecture of the Linux operating system. It discusses the main components of Linux including the kernel, process management, memory management, file systems, device drivers, network stack, and architecture-dependent code. The kernel is at the core and acts as a resource manager. It uses a monolithic design. Process and memory management are handled via data structures like task_struct and buddy allocation. Virtual memory is implemented using page tables. File systems organize files in a hierarchy with inodes. Device drivers interface with hardware. The network stack follows a layered model. Architecture code is separated by subdirectory.
Linux was created in 1991 by Linus Torvalds as an open-source alternative to the proprietary Minix operating system. Some key features of Linux include its portability across different hardware, its open-source and collaborative development model, its ability to support multiple users and programs running simultaneously, its hierarchical file system, and its built-in security features like password protection. Linux also provides advantages over other operating systems like Windows by being free, allowing for custom modifications, and providing highly secure and robust servers.
A tutorial for beginners who are curious to learn about the Linux boot process. If you have any more doubts, you can contact me through my email given in the slide, or through my blog: mastro77.blogspot.in
NFS allows remote access to files on a server from client machines. It uses stateless servers so server disruptions don't affect clients, and clients can continue accessing files after a server reboot. The client parses file paths and looks up components individually to accommodate different file naming conventions. NFS adopted UNIX file semantics and operations like open, read, write, and close, along with basic file types and permissions.
The document outlines the 14 steps to install Red Hat Enterprise Linux (RHEL) through a graphical user interface (GUI). The steps include inserting the RHEL DVD, selecting the language, partitioning disks to create mounts for /boot, /home, and swap, setting the root password, and initiating installation. After installation, 9 post-installation configuration steps are described to accept licenses, configure firewall settings, SELinux, sound devices, and more.
The document provides an overview of the UNIX operating system. It discusses the history and development of UNIX from the 1960s onward. It describes the key features of UNIX including its layered architecture, kernel, shell, process management, file system, and security features. It also covers basic UNIX commands for working with files and directories, permissions, and getting help. The objective is to introduce readers to fundamental concepts of the UNIX OS.
The document provides an overview of the UNIX operating system. It discusses the components of a computer system including hardware, operating system, utilities, and application programs. It then defines the operating system as a program that acts as an interface between the user and computer hardware. The document outlines the goals of an operating system and provides a brief history of the development of UNIX from Multics. It also describes some key concepts of UNIX including the kernel, shell, files, directories, and multi-user capabilities.
The document summarizes the architecture of the Linux operating system. It discusses the main components of Linux including the kernel, process management, memory management, file systems, device drivers, network stack, and architecture-dependent code. The kernel is at the core and acts as a resource manager. It uses a monolithic design. Process and memory management are handled via data structures like task_struct and buddy allocation. Virtual memory is implemented using page tables. File systems organize files in a hierarchy with inodes. Device drivers interface with hardware. The network stack follows a layered model. Architecture code is separated by subdirectory.
Linux was created in 1991 by Linus Torvalds as an open-source alternative to the proprietary Minix operating system. Some key features of Linux include its portability across different hardware, its open-source and collaborative development model, its ability to support multiple users and programs running simultaneously, its hierarchical file system, and its built-in security features like password protection. Linux also provides advantages over other operating systems like Windows by being free, allowing for custom modifications, and providing highly secure and robust servers.
A tutorial for beginners who are curious to learn about the Linux boot process. If you have any more doubts, you can contact me through my email given in the slide, or through my blog: mastro77.blogspot.in
NFS allows remote access to files on a server from client machines. It uses stateless servers so server disruptions don't affect clients, and clients can continue accessing files after a server reboot. The client parses file paths and looks up components individually to accommodate different file naming conventions. NFS adopted UNIX file semantics and operations like open, read, write, and close, along with basic file types and permissions.
The document discusses kernel, modules, and drivers in Linux. It provides an introduction to the Linux kernel, explaining what it is and its main functions. It then covers compiling the Linux kernel from source, including downloading the source code, configuring options, and compiling and installing the new kernel. It also discusses working with the GRUB 2 boot loader, including making temporary and persistent changes to the boot menu.
This document discusses user and file permissions in Linux. It covers how every file is owned by a user and group, and how file access is defined using file mode bits. These bits determine read, write and execute permissions for the file owner, group and others. An example of a file with permissions -rw-rw-r-- is provided to demonstrate this. User accounts are configured in /etc/passwd, while passwords are securely stored in /etc/shadow. Common commands for managing users, groups, permissions and default file access (umask) are also outlined.
Unix was created in 1969 by Ken Thompson at Bell Labs to allow multiple users to access a computer simultaneously. It features a multi-user design, hierarchical file system, and shell interface. The kernel handles memory management, process scheduling, and device interactions to enable these features. Common Unix commands like cat, ls, cp and rm allow users to work with files and directories from the shell. File permissions and ownership are managed through inodes to control access across users.
Disk and File System Management in LinuxHenry Osborne
This document discusses disk and file system management in Linux. It covers MBR and GPT partition schemes, logical volume management, common file systems like ext4 and XFS, mounting file systems, and file system maintenance tools. It also discusses disk quotas, file ownership, permissions, and the umask command for setting default permissions.
Linux is an open-source operating system based on Unix, designed for multi-user environments. The document provides an overview of basic Linux commands like ls, mkdir, cd for navigating files and directories, as well as more advanced commands for manipulating files, checking system resources, and getting system information. It also lists and describes many common Linux commands and their functions.
The document provides an overview of common Linux commands organized into categories, with brief explanations of each command. It covers commands for working with files and directories (ls, cd, cp, rm), processes (ps, top, kill), networking (ping, ifconfig), file archiving and compression (tar, gzip), and more. It also lists important directories in the Linux file system such as /bin, /usr/bin, /etc, and directories under /usr.
The document discusses Linux file systems. It describes that Linux uses a hierarchical tree structure with everything treated as a file. It explains the basic components of a file system including the boot block, super block, inode list, and block list. It then covers different types of file systems for Linux like ext2, ext3, ext4, FAT32, NTFS, and network file systems like NFS and SMB. It also discusses absolute vs relative paths and mounting and unmounting filesystems using the mount and umount commands.
This document provides an introduction to Linux, including:
- A brief history of Linux from its origins in the 1980s to its use today on servers, supercomputers, and other devices.
- An overview of Linux distributions such as Ubuntu, Red Hat Enterprise Linux, and others.
- Popular applications that run on Linux, such as OpenOffice, web browsers, email clients, and multimedia software.
- Languages supported by Linux user interfaces and documentation.
- Reasons for switching to Linux like security, cost savings, and stability compared to other operating systems.
- Considerations for switching like hardware and software compatibility.
Linux is an open-source operating system that can be used as an alternative to proprietary operating systems like Windows. The document provides an overview of Linux, including its history beginning as a free Unix-like kernel developed by Linus Torvalds. It discusses the GNU project and how Linux combined with GNU software to form a complete free operating system. Additionally, it covers topics like Debian Linux, package management, GUI and CLI interfaces, and basic Linux commands.
BIOS and UEFI are types of firmware that control the boot process. BIOS uses the MBR partition table and boots by loading the MBR, then the partition bootsector. UEFI uses the GPT partition table and ESP partition, and its boot manager loads UEFI drivers and bootloaders. Secure Boot is an UEFI extension that verifies signatures of boot components for security.
Linux is an open-source operating system based on the Unix model. It can run on a variety of hardware and has thousands of available programs. The document discusses the history and development of Linux from its origins in the 1960s through its creation by Linus Torvalds in 1991. It also covers key Linux concepts like kernels, processes, threads, file systems, and boot processes. Community links are provided for learning more about the Linux kernel, drivers, boot loader, and file systems.
Embedded Systems are basically Single Board Computers (SBCs) with limited and specific functional capabilities. All the components that make up a computer like the Microprocessor, Memory Unit, I/O Unit etc. are hosted on a single board. Their functionality is subject to constraints, and is embedded as a part of the complete device including the hardware, in contrast to the Desktop and Laptop computers which are essentially general purpose (Read more about what is embedded system). The software part of embedded systems used to be vendor specific instruction sets built in as firmware. However, drastic changes have been brought about in the last decade driven by the spurt in technology, and thankfully, the Moore’s Law. New, smaller, smarter, elegant but more powerful and resource hungry devices like Smart-phones, PDAs and cell-phones have forced the vendors to make a decision between hosting System Firmware or full-featured Operating Systems embedded with devices. The choice is often crucial and is decided by parameters like scope, future expansion plans, molecularity, scalability, cost etc. Most of these features being inbuilt into Operating Systems, hosting operating systems more than compensates the slightly higher cost overhead associated with them. Among various Embedded System Operating Systems like VxWorks, pSOS, QNX, Integrity, VRTX, Symbian OS, Windows CE and many other commercial and open-source varieties, Linux has exploded into the computing scene. Owing to its popularity and open source nature, Linux is evolving as an architecturally neutral OS, with reliable support for popular standards and features
This document discusses shells and shell scripting in Linux. It provides information on common Linux shells like Bash, Bourne shell, C shell, etc. It describes the basic functions of shells like command interpretation, I/O redirection, variables, parameters and more. Shell scripts allow automating tasks and complex series of commands. The document also covers shell script basics, special parameters, variables, I/O redirection operators and more shell scripting concepts.
The document provides an introduction to Linux, including the purpose of operating systems, key features of the Linux OS, the origins of Linux, common Linux distributions, and uses of Linux in industry. It discusses how Linux works with the Linux kernel and open source software like GNU to form the operating system. It also covers Linux distributions, common applications, and uses of Linux as a server, workstation, for scientific/engineering purposes, and more.
1. The document provides instructions for downloading and installing the Ubuntu 16.04 LTS operating system on a computer. It describes burning the ISO file to a CD, DVD, or USB drive and then booting from it to begin the installation process.
2. The installation process involves selecting options like installing updates and third-party software. It also recommends connecting to the internet and allocating disk space for the installation.
3. The document outlines the steps of selecting a location, keyboard layout, creating login credentials before finishing installation and restarting to complete the process.
The document discusses the history and advantages of Linux compared to other operating systems like Windows, DOS and UNIX. It explains how the GNU project was started to develop a free and open source UNIX-like operating system. It then describes how Linus Torvalds developed the initial Linux kernel in 1991 building on the work of the GNU project. It highlights some key advantages of Linux like high security, many available tools and the flexibility of the environment. It also provides a brief overview of some common Linux components like the kernel, shells, KDE/GNOME desktop environments and the directory structure.
The document discusses the booting and startup sequence of a computer system. It explains that booting is required because hardware does not know where the operating system is located or how to load it. The BIOS bootstrap loader locates the kernel and loads it into memory to start the operating system. It describes the boot process where the CPU is reset and execution is transferred to the BIOS bootstrap program stored in ROM. Finally, it provides examples of how DOS specifically performs its boot process by loading files like IO.SYS, MSDOS.SYS, CONFIG.SYS, and AUTOEXEC.BAT.
Unix is a multi-user, multi-tasking operating system that was first created in 1969 at Bell Labs. It allows many users to use the system simultaneously running multiple programs. Linux originated in 1991 as a personal project and is now a free, open source Unix-like operating system. It features multi-tasking, virtual memory, networking and more. Linux is widely used for servers, workstations, internet services and more due to its low cost, stability, and reliability compared to other operating systems.
Overview of the Linux Kernel, based on "Anatomy of the Linux Kernel" by M. Tim Jones, (IBM Developerworks) http://www.ibm.com/developerworks/linux/library/l-linux-kernel/
The document provides an introduction to Linux operating system and how it differs from MS-DOS in allowing multiple users to use the system simultaneously. It then describes the process of installing Ubuntu Linux, including inserting the installation CD, selecting language and location, configuring the keyboard, and installing and completing the process. Finally, it lists and describes over 80 common Linux commands.
This document provides an introduction and overview of the UNIX operating system. It discusses that UNIX is an operating system, like Windows, that manages communication between software and hardware. Popular versions of UNIX include Linux and Android. The document outlines reasons for using UNIX such as reliability, low/no cost, and open source access. It describes the core components of UNIX including the kernel, bootloader, daemons, and shells. Key features like being portable, multi-user, and providing security are highlighted. Common UNIX commands and utilities are listed along with file permissions, redirection, pipes, and filters.
The document discusses the UNIX operating system. It describes UNIX as a stable, multi-user, multi-tasking system used for servers, desktops and laptops. It also discusses the different components that make up the UNIX system, including the kernel, shell, and programs. It explains the directory structure and file hierarchy with the root directory at the top. It provides examples of different types of files and concludes by describing some basic date and time commands in UNIX.
The document discusses kernel, modules, and drivers in Linux. It provides an introduction to the Linux kernel, explaining what it is and its main functions. It then covers compiling the Linux kernel from source, including downloading the source code, configuring options, and compiling and installing the new kernel. It also discusses working with the GRUB 2 boot loader, including making temporary and persistent changes to the boot menu.
This document discusses user and file permissions in Linux. It covers how every file is owned by a user and group, and how file access is defined using file mode bits. These bits determine read, write and execute permissions for the file owner, group and others. An example of a file with permissions -rw-rw-r-- is provided to demonstrate this. User accounts are configured in /etc/passwd, while passwords are securely stored in /etc/shadow. Common commands for managing users, groups, permissions and default file access (umask) are also outlined.
Unix was created in 1969 by Ken Thompson at Bell Labs to allow multiple users to access a computer simultaneously. It features a multi-user design, hierarchical file system, and shell interface. The kernel handles memory management, process scheduling, and device interactions to enable these features. Common Unix commands like cat, ls, cp and rm allow users to work with files and directories from the shell. File permissions and ownership are managed through inodes to control access across users.
Disk and File System Management in LinuxHenry Osborne
This document discusses disk and file system management in Linux. It covers MBR and GPT partition schemes, logical volume management, common file systems like ext4 and XFS, mounting file systems, and file system maintenance tools. It also discusses disk quotas, file ownership, permissions, and the umask command for setting default permissions.
Linux is an open-source operating system based on Unix, designed for multi-user environments. The document provides an overview of basic Linux commands like ls, mkdir, cd for navigating files and directories, as well as more advanced commands for manipulating files, checking system resources, and getting system information. It also lists and describes many common Linux commands and their functions.
The document provides an overview of common Linux commands organized into categories, with brief explanations of each command. It covers commands for working with files and directories (ls, cd, cp, rm), processes (ps, top, kill), networking (ping, ifconfig), file archiving and compression (tar, gzip), and more. It also lists important directories in the Linux file system such as /bin, /usr/bin, /etc, and directories under /usr.
The document discusses Linux file systems. It describes that Linux uses a hierarchical tree structure with everything treated as a file. It explains the basic components of a file system including the boot block, super block, inode list, and block list. It then covers different types of file systems for Linux like ext2, ext3, ext4, FAT32, NTFS, and network file systems like NFS and SMB. It also discusses absolute vs relative paths and mounting and unmounting filesystems using the mount and umount commands.
This document provides an introduction to Linux, including:
- A brief history of Linux from its origins in the 1980s to its use today on servers, supercomputers, and other devices.
- An overview of Linux distributions such as Ubuntu, Red Hat Enterprise Linux, and others.
- Popular applications that run on Linux, such as OpenOffice, web browsers, email clients, and multimedia software.
- Languages supported by Linux user interfaces and documentation.
- Reasons for switching to Linux like security, cost savings, and stability compared to other operating systems.
- Considerations for switching like hardware and software compatibility.
Linux is an open-source operating system that can be used as an alternative to proprietary operating systems like Windows. The document provides an overview of Linux, including its history beginning as a free Unix-like kernel developed by Linus Torvalds. It discusses the GNU project and how Linux combined with GNU software to form a complete free operating system. Additionally, it covers topics like Debian Linux, package management, GUI and CLI interfaces, and basic Linux commands.
BIOS and UEFI are types of firmware that control the boot process. BIOS uses the MBR partition table and boots by loading the MBR, then the partition bootsector. UEFI uses the GPT partition table and ESP partition, and its boot manager loads UEFI drivers and bootloaders. Secure Boot is an UEFI extension that verifies signatures of boot components for security.
Linux is an open-source operating system based on the Unix model. It can run on a variety of hardware and has thousands of available programs. The document discusses the history and development of Linux from its origins in the 1960s through its creation by Linus Torvalds in 1991. It also covers key Linux concepts like kernels, processes, threads, file systems, and boot processes. Community links are provided for learning more about the Linux kernel, drivers, boot loader, and file systems.
Embedded Systems are basically Single Board Computers (SBCs) with limited and specific functional capabilities. All the components that make up a computer like the Microprocessor, Memory Unit, I/O Unit etc. are hosted on a single board. Their functionality is subject to constraints, and is embedded as a part of the complete device including the hardware, in contrast to the Desktop and Laptop computers which are essentially general purpose (Read more about what is embedded system). The software part of embedded systems used to be vendor specific instruction sets built in as firmware. However, drastic changes have been brought about in the last decade driven by the spurt in technology, and thankfully, the Moore’s Law. New, smaller, smarter, elegant but more powerful and resource hungry devices like Smart-phones, PDAs and cell-phones have forced the vendors to make a decision between hosting System Firmware or full-featured Operating Systems embedded with devices. The choice is often crucial and is decided by parameters like scope, future expansion plans, molecularity, scalability, cost etc. Most of these features being inbuilt into Operating Systems, hosting operating systems more than compensates the slightly higher cost overhead associated with them. Among various Embedded System Operating Systems like VxWorks, pSOS, QNX, Integrity, VRTX, Symbian OS, Windows CE and many other commercial and open-source varieties, Linux has exploded into the computing scene. Owing to its popularity and open source nature, Linux is evolving as an architecturally neutral OS, with reliable support for popular standards and features
This document discusses shells and shell scripting in Linux. It provides information on common Linux shells like Bash, Bourne shell, C shell, etc. It describes the basic functions of shells like command interpretation, I/O redirection, variables, parameters and more. Shell scripts allow automating tasks and complex series of commands. The document also covers shell script basics, special parameters, variables, I/O redirection operators and more shell scripting concepts.
The document provides an introduction to Linux, including the purpose of operating systems, key features of the Linux OS, the origins of Linux, common Linux distributions, and uses of Linux in industry. It discusses how Linux works with the Linux kernel and open source software like GNU to form the operating system. It also covers Linux distributions, common applications, and uses of Linux as a server, workstation, for scientific/engineering purposes, and more.
1. The document provides instructions for downloading and installing the Ubuntu 16.04 LTS operating system on a computer. It describes burning the ISO file to a CD, DVD, or USB drive and then booting from it to begin the installation process.
2. The installation process involves selecting options like installing updates and third-party software. It also recommends connecting to the internet and allocating disk space for the installation.
3. The document outlines the steps of selecting a location, keyboard layout, creating login credentials before finishing installation and restarting to complete the process.
The document discusses the history and advantages of Linux compared to other operating systems like Windows, DOS and UNIX. It explains how the GNU project was started to develop a free and open source UNIX-like operating system. It then describes how Linus Torvalds developed the initial Linux kernel in 1991 building on the work of the GNU project. It highlights some key advantages of Linux like high security, many available tools and the flexibility of the environment. It also provides a brief overview of some common Linux components like the kernel, shells, KDE/GNOME desktop environments and the directory structure.
The document discusses the booting and startup sequence of a computer system. It explains that booting is required because hardware does not know where the operating system is located or how to load it. The BIOS bootstrap loader locates the kernel and loads it into memory to start the operating system. It describes the boot process where the CPU is reset and execution is transferred to the BIOS bootstrap program stored in ROM. Finally, it provides examples of how DOS specifically performs its boot process by loading files like IO.SYS, MSDOS.SYS, CONFIG.SYS, and AUTOEXEC.BAT.
Unix is a multi-user, multi-tasking operating system that was first created in 1969 at Bell Labs. It allows many users to use the system simultaneously running multiple programs. Linux originated in 1991 as a personal project and is now a free, open source Unix-like operating system. It features multi-tasking, virtual memory, networking and more. Linux is widely used for servers, workstations, internet services and more due to its low cost, stability, and reliability compared to other operating systems.
Overview of the Linux Kernel, based on "Anatomy of the Linux Kernel" by M. Tim Jones, (IBM Developerworks) http://www.ibm.com/developerworks/linux/library/l-linux-kernel/
The document provides an introduction to Linux operating system and how it differs from MS-DOS in allowing multiple users to use the system simultaneously. It then describes the process of installing Ubuntu Linux, including inserting the installation CD, selecting language and location, configuring the keyboard, and installing and completing the process. Finally, it lists and describes over 80 common Linux commands.
This document provides an introduction and overview of the UNIX operating system. It discusses that UNIX is an operating system, like Windows, that manages communication between software and hardware. Popular versions of UNIX include Linux and Android. The document outlines reasons for using UNIX such as reliability, low/no cost, and open source access. It describes the core components of UNIX including the kernel, bootloader, daemons, and shells. Key features like being portable, multi-user, and providing security are highlighted. Common UNIX commands and utilities are listed along with file permissions, redirection, pipes, and filters.
The document discusses the UNIX operating system. It describes UNIX as a stable, multi-user, multi-tasking system used for servers, desktops and laptops. It also discusses the different components that make up the UNIX system, including the kernel, shell, and programs. It explains the directory structure and file hierarchy with the root directory at the top. It provides examples of different types of files and concludes by describing some basic date and time commands in UNIX.
Unix operating system architecture with file structure amol_chavan
The document provides information about the Unix operating system, including:
- Unix was originally developed in 1969 at Bell Labs and consists of programs that link the computer and user. There are various commercial and open-source variants available.
- It allows for multi-user access where many users can use the system at once, and multitasking where users can run multiple programs simultaneously.
- The kernel manages hardware interaction, memory, processes, I/O, and enforces access permissions. The shell interprets commands for the kernel to execute programs and utilities like cp, mv, cat, and grep.
- All data is organized into files within a hierarchical directory structure called the file system, with directories like
The document provides information about an upcoming UNIX and Shell Scripting workshop, including contact information for the workshop instructor R. Chockalingam, and covers topics that will be discussed such as the architecture and components of the UNIX operating system, basic UNIX commands, text editors, the file system structure, flags and arguments, and more.
This document provides an overview of the UNIX operating system and some basic UNIX commands. It discusses what UNIX is, its origins at Bell Laboratories in 1969, and some of its core functions like providing a filing system and loading/executing programs. It also covers the UNIX kernel and layers, file system structure, shells, logging in, and examples of common commands like ls, cat, more, pr, grep, passwd, who, and man.
This document provides an overview of the Unix operating system, including its history, architecture, basic concepts, and common commands. It describes how Unix was originally developed at Bell Labs in the 1960s and discusses some popular Unix variants. The main components of the Unix architecture are explained as the kernel, shell, commands/utilities, and files/directories. Common Unix tasks like logging in, changing passwords, listing files, and logging out are demonstrated.
This document provides an overview of the UNIX operating system. It begins with an introduction to UNIX, noting that it was developed in 1969 at Bell Labs and is a portable, multi-user, multi-tasking operating system. The document then covers the history of UNIX, its key features including multi-user capability and security, and common shells like Bourne shell. It also discusses common UNIX distributions, basic commands like ls, cat and cp, and includes a questions and answers section and references.
Basics of Linux Commands, Git and GithubDevang Garach
Teachers Day 2020 - Basics of Linux Commands, Git and Github
History of Linux? (Fast Forward)
Brief overview of Linux OS files/ folders system
Basics Commands on Linux (Useful in daily routine)
What is Git? How to use?
Difference between Git and GitHub
How can we host HTML based website,
and to get github.io domain, Free of cost ₹ 0/-
The document discusses the Unix operating system. It describes Unix systems as using plain text storage, a hierarchical file system, and treating devices as files. It also discusses the Unix philosophy of using small, strung together programs instead of large monolithic programs. The document then summarizes Unix kernel subsystems like process management and memory management. It provides an overview of shell scripts, their advantages, and how to create and use variables within scripts.
The kernel manages system resources like disks, tapes, printers, and communication lines. The file system provides an organizing structure for data storage through files and directories arranged in a hierarchical tree structure with the root directory at the top. The shell acts as the interface between the user and the operating system by translating commands to actions by the kernel and programs. UNIX allows for multi-tasking of multiple processes running simultaneously and is multi-user, enabling multiple users to use the same system simultaneously.
This document provides an overview of Linux fundamentals, including:
- The kernel acts as an interface between hardware and software, handling processes and resource allocation.
- The userland includes standard libraries that allow programs to communicate with the kernel.
- Files are organized in a hierarchy with directories like /home for user files, /etc for configurations, and /var for variable files.
- Commands like ls, grep, and find allow viewing and searching files, while pipes, redirection, and compression utilities manage file input/output.
Unix Shell Script - 2 Days Session.pptxRajesh Kumar
The document provides an overview of Unix and shell scripting. It discusses what Unix is, its architecture including the kernel, shell, commands, and filesystem. It then covers what shell scripts are, their components and syntax. The document provides examples of shell script code and discusses how to invoke scripts, execute them in background, and useful metacharacters. It also covers various Unix commands like ls, cd, grep, find and their usage.
Linux is an operating system with several key components:
- A kernel that manages system resources and processes. Processes allow programs to run in memory simultaneously.
- Files and directories that organize data. Directories contain files and other directories.
- Tools like tar for backing up files and mounting disks. The mount command attaches filesystems.
- A shell interface for entering commands to interact with the system, along with utilities like ls, cp, and man.
- Permissions and variables that control access and store values for commands.
The Unix operating system acts as an interface between the user and computer. The kernel allocates system resources, coordinates internals, and interacts with hardware. Users communicate with the kernel via a shell program that translates commands for the kernel to understand. In Unix, everything is organized into files that are grouped into directories in a tree structure called the filesystem. Common commands allow users to view files and directories, check system information, manage files and directories, and get manual pages.
This document provides an overview of file administration in Linux. It describes the three types of files in Linux - ordinary disk files which contain user data, special files which represent devices, and directory files which contain other files and directories. It outlines guidelines for naming files and directories, explaining which characters to avoid. It also introduces the file command for determining a file's type and describes the basic Linux directory structure with files and directories organized in a tree format.
Linux is a fully-networked, multi-user, multitasking operating system similar to Unix. It was created in 1991 by Linus Torvalds and is now used widely due to its low cost, stability, and ability to run on different hardware platforms. Linux uses a command line interface where users log in and issue commands to perform tasks like copying files, installing software, and checking system resources. Common commands include ls to list files, cd to change directories, and man to view manuals.
- Linux originated as a clone of the UNIX operating system. Key developers included Linus Torvalds and developers from the GNU project.
- Linux is open source, multi-user, and can run on a variety of hardware. It includes components like the Linux kernel, shell, terminal emulator, and desktop environments.
- The document provides information on common Linux commands, files, users/groups, permissions, and startup scripts. It describes the Linux file system and compression/archiving utilities.
Linux is a fully-featured open source operating system based on Unix. It was created by Linus Torvalds in 1991 and has since grown in popularity. Linux uses a kernel to manage hardware resources and runs on multiple hardware platforms. Users interact with Linux through a shell and can execute commands, manage files and directories, and perform other tasks. Common Linux commands include ls, cd, pwd, cp, and more.
Introduction to Unix operating system Chapter 1-PPT Mrs.Sowmya JyothiSowmya Jyothi
Unix is a multitasking, multiuser operating system developed in 1969 at Bell Labs. It allows multiple users to use a computer simultaneously and users can run multiple programs at once. There are several Unix variants like Solaris, AIX, and Linux. Unix was originally written for the PDP-7 computer in C programming language, making it portable. It uses a hierarchical file system and treats all resources as files with permissions. Processes run programs and the shell interprets commands to run programs or interact with the kernel for system calls. Everything in Unix is either a file or a process.
The document provides information about the LAMP stack and its components - Linux, Apache, MySQL, and PHP. It then discusses Linux commands, directories, editors, and scheduling tasks using cron jobs. Key points include:
- LAMP is an open source software solution stack using Linux, Apache, MySQL, and PHP. It allows for easy coding and deployment of PHP applications.
- Linux commands covered include cd, ls, pwd, touch, rm. Directories include /, /boot, /bin, /usr, /var. Editors discussed are vi and emacs.
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1. Chapter 2
Introduction to UNIX concepts
Meenal K Jabde
Modern College of Arts, Science and Commerce
Ganeshkhind, Pune 16
2. Agenda
1. Introduction to Unix Operating System.
2. Features of Unix.
3. Architecture of the Unix Operating System.
4. Introduction to File System and Process Environment.
5. Working with Unix
The login prompt.
General features of Unix commands/ command structure.
Command arguments and options.
Understanding of some basic commands such as echo, printf, ls,
who,
date, passwd, cal, Combining commands
3. Introduction to Unix Operating System.
Unix is an Operating System that is truly the base of
all Operating Systems like Ubuntu, Solaris, POSIX,
etc.
It was developed in the 1970s by Ken Thompson,
Dennis Ritchie, and others in the AT&T Laboratories.
It was originally meant for programmers developing
software rather than non-programmers.
Unix was the heart of the operating System.
4. Unix Architecture
Layer-1: Hardware – It consists of all hardware related
information.
Layer-2: Kernel –
It interacts with hardware and most of the tasks like
memory management, task scheduling, and management
are done by the kernel.
Layer-3: Shell commands –
Shell is the utility that processes your requests. When you
type in a command at the terminal, the shell interprets the
command and calls the program that you want.
There are various commands like cp, mv, cat, grep, id, wc,
nroff, a.out and more.
Layer-4: Application Layer –
It is the outermost layer that executes the given external
applications.
6. The system call and library interface represent the border between user programs and the kernel. System
calls look like ordinary function calls in C programs. Assembly language programs may invoke system
calls directly without a system call library. The libraries are linked with the programs at compile time.
The set of system calls into those that interact with the file subsystem and some system calls interact
with the process control subsystem. The file subsystem manages files, allocating file space, administering
free space, controlling access to files, and retrieving data for users.
Processes interact with the file subsystem via a specific set of system calls, such as open (to open a file
for reading or writing), close, read, write, stat (query the attributes of a file), chown (change the record of
who owns the file), and chmod (change the access permissions of a file).
The file subsystem accesses file data using a buffering mechanism that regulates data flow between the
kernel and secondary storage devices. The buffering mechanism interacts with block I/O device drivers to
initiate data transfer to and from the kernel.
Device drivers are the kernel modules that control the operator of peripheral devices. The file subsystem
also interacts directly with “raw” I/O device drivers without the intervention of the buffering mechanism.
Finally, the hardware control is responsible for handling interrupts and for communicating with the
machine. Devices such as disks or terminals may interrupt the CPU while a process is executing. If so,
the kernel may resume execution of the interrupted process after servicing the interrupt.
Interrupts are not serviced by special processes but by special functions in the kernel, called in the
context of the currently running process.
8. Introduction to File System and Process Environment.
Unix file system is a logical method of organizing and
storing large amounts of information in a way that
makes it easy to manage.
A file is a smallest unit in which the information is
stored. Unix file system has several important
features.
All data in Unix is organized into files. All files are
organized into directories. These directories are
organized into a tree-like structure called the file
system.
Files in Unix System are organized into multi-level
hierarchy structure known as a directory tree.
At the very top of the file system is a directory called
“root” which is represented by a “/”. All other files are
“descendants” of root.
9. Types of Unix files –
The UNIX files system
contains several
different types of files.
10. 1. Ordinary files – An ordinary file is a file on the system that
contains data, text, or program instructions.
2. Directories – Directories store both special and ordinary files.
3. Special Files – Used to represent a real physical device such as
a printer, tape drive or terminal, used for Input/Output (I/O)
operations.
4. Pipes – UNIX allows you to link commands together using a
pipe.
5. Sockets – A Unix socket (or Inter-process communication
socket) is a special file which allows for advanced inter-process
communication.
6. Symbolic Link – Symbolic link is used for referencing some
other file of the file system. Symbolic link is also known as Soft
link.
11. Unix Command Line Structure
A command is a program that tells the Unix system to do something. It has the
form:
command [options] [arguments]
where an argument indicates on what the command is to perform its action,
usually a file or series of files. An option modifies the command, changing the
way it performs.
Commands are case sensitive. command and Command are not the same.
Options are generally preceded by a hyphen (-), and for most commands, more
than one option can be strung together, in the form:
command -[option][option][option]
12. Basic Commands
Listing Files- To list the files and directories stored in the current directory, use
the following command −
$ls
Here is the sample output of the above command −
$ls
bin hosts lib res.03
ch07 hw1 pub test_results
ch07.bak hw2 res.01 users
docs hw3 res.02 work
13. The command ls supports the -l option which would help you to get more information
about the listed files −
$ls -l
total 1962188
drwxrwxr-x 2 amrood amrood 4096 Dec 25 09:59 uml
-rw-rw-r-- 1 amrood amrood 5341 Dec 25 08:38 uml.jpg
drwxr-xr-x 2 amrood amrood 4096 Feb 15 2006 univ
drwxr-xr-x 2 root root 4096 Dec 9 2007 urlspedia
-rw-r--r-- 1 root root 276480 Dec 9 2007 urlspedia.tar
drwxr-xr-x 8 root root 4096 Nov 25 2007 usr
drwxr-xr-x 2 200 300 4096 Nov 25 2007 webthumb-1.01
-rwxr-xr-x 1 root root 3192 Nov 25 2007 webthumb.php
-rw-rw-r-- 1 amrood amrood 20480 Nov 25 2007 webthumb.tar
-rw-rw-r-- 1 amrood amrood 5654 Aug 9 2007 yourfile.mid
-rw-rw-r-- 1 amrood amrood 166255 Aug 9 2007 yourfile.swf
drwxr-xr-x 11 amrood amrood 4096 May 29 2007 zlib-1.2.3
14. echo Command
echo command in linux is used to display line of text/string that
are passed as an argument . This is a built-in command that is
mostly used in shell scripts and batch files to output status text to
the screen or a file.
Syntax :
echo [option] [string]
Displaying a text/string :
Syntax :
echo [string]
15. Printf command
“printf” command in Linux is used to display the
given string, number or any other format
specifier on the terminal window. It works the
same way as “printf” works in programming
languages like C.
Syntax:
$printf [-v var] format [arguments]
printf can have format specifiers, escape
sequences or ordinary characters.
Format Specifiers: The most commonly used
printf specifiers are %s, %b, %d, %x and %f.
16. %s specifier: It is basically a string specifier for string
output.
$printf "%sn" "Hello, World!"
%b specifier: It is same as string specifier, but it allows
us to interpret escape sequences with an argument.
Input : printf "%bn" "Hello, World! n" "From Geeks For
Geeksn"
Output: Hello, World!
From Geeks For Geeks
17. who command
who command is used to find out the following
information :
1. Time of last system boot
2. Current run level of the system
3. List of logged in users and more.
Description : The who command is used to get
information about currently logged in user on to system.
Syntax : $who [options] [filename]
18. Examples :
1. The who command displays the following information for each
user currently logged in to the system if no option is provided :
Login name of the users
Terminal line numbers
Login time of the users in to system
Remote host name of the user
hduser@mahesh-Inspiron-3543:~$ who
hduser tty7 2018-03-18 19:08 (:0)
hduser@mahesh-Inspiron-3543:~$
19. Date command
date command is used to display the system
date and time. date command is also used to
set date and time of the system. By default the
date command displays the date in the time
zone on which unix/linux operating system is
configured.You must be the super-user (root) to
change the date and time.
Syntax:
date [OPTION]... [+FORMAT]
Command:
$date
Output:
Tue Oct 10 22:55:01 PDT 2017
20. Passwd command
passwd command in Linux is used
to change the user account
passwords. The root user
reserves the privilege to change
the password for any user on the
system, while a normal user can
only change the account
password for his or her own
account.
Syntax:
passwd [options] [username]
21. cal command
If a user wants a quick view of calendar
in Linux terminal, cal is the command
for you. By default, cal command shows
current month calendar as output.
cal command is a calendar command in
Linux which is used to see the calendar
of a specific month or a whole year.
Syntax:
cal [ [ month ] year]
Rectangular bracket means it is optional,
so if used without option, it will display
a calendar of current month and year.
cal : Shows current month calendar on
the terminal
22. Combining commands
This will give you a listing of the
current directory ( ls ), find out
which directory you’re currently in (
pwd ), and display your login name (
whoami ) all at once.
23. The Logical AND
Operator (&&)
If you want the second command to only
run if the first command is successful,
separate the commands with the logical
AND operator, which is two ampersands
( && ). For example, we want to make a
directory called MyFolder and then
change to that directory–provided it was
successfully created. So, we type the
following on the command line and
press Enter.
mkdir MyFolder && cd MyFolder
The folder was successfully created, so
the cd command was executed, and we
are now in the new folder.
24. Option Three: The
Logical OR Operator (||)
Sometimes you might want to execute a second
command only if the first command does not
succeed. To do this, we use the logical OR
operator, or two vertical bars ( || ). For example,
we want to check to see if the MyFolder
directory exists ( [ -d ~/MyFolder ] ) and create
it if it doesn’t ( mkdir ~/MyFolder ). So, we
type the following command at the prompt and
press Enter.
[ -d ~/MyFolder ] || mkdir ~/MyFolder
Be sure there is a space after the first bracket
and before the second bracket or the first
command that checks if the directory exists will
not work.