- Directory structures organize files in a storage system and contain metadata about each file's name, location, size, and type. They allow operations like creating, searching, deleting, listing, and renaming files.
- Early systems used single-level directories with one list of all files, but this does not allow multiple files with the same name or grouping of files.
- Modern systems commonly use tree-structured directories that allow nesting files into subdirectories, making searching more efficient and allowing grouping of similar files. Directories can also be connected in acyclic graphs to enable sharing of files between directories through links.
This is the twelfth set of slightly updated slides from a Perl programming course that I held some years ago.
I want to share it with everyone looking for intransitive Perl-knowledge.
A table of content for all presentations can be found at i-can.eu.
The source code for the examples and the presentations in ODP format are on https://github.com/kberov/PerlProgrammingCourse
This is the twelfth set of slightly updated slides from a Perl programming course that I held some years ago.
I want to share it with everyone looking for intransitive Perl-knowledge.
A table of content for all presentations can be found at i-can.eu.
The source code for the examples and the presentations in ODP format are on https://github.com/kberov/PerlProgrammingCourse
This presentation describes about the various memory allocation methods like first fit, best fit and worst fit in memory management and also about fragmentation problem and solution for the problem.
Operating System
Topic Memory Management
for Btech/Bsc (C.S)/BCA...
Memory management is the functionality of an operating system which handles or manages primary memory. Memory management keeps track of each and every memory location either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes. It decides which process will get memory at what time. It tracks whenever some memory gets freed or unallocated and correspondingly it updates the status.
Useful documents for engineering students of CSE, and specially for students of aryabhatta knowledge university, Bihar (A.K.U. Bihar). It covers following topics, File concept, access methods, directory structure
This presentation describes about the various memory allocation methods like first fit, best fit and worst fit in memory management and also about fragmentation problem and solution for the problem.
Operating System
Topic Memory Management
for Btech/Bsc (C.S)/BCA...
Memory management is the functionality of an operating system which handles or manages primary memory. Memory management keeps track of each and every memory location either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes. It decides which process will get memory at what time. It tracks whenever some memory gets freed or unallocated and correspondingly it updates the status.
Useful documents for engineering students of CSE, and specially for students of aryabhatta knowledge university, Bihar (A.K.U. Bihar). It covers following topics, File concept, access methods, directory structure
File system in operating system e learningLavanya Sharma
This Module covers the basic of file system, its types, accessing methods, security and architecture of Unix operating system. This study material is very useful for UG and PG students of Engineering colleges and University where this course is in their Syllabus.
Definition
File Structure
Directory Structure: Single level, Two-level, Tree-structured , Acyclic graph, General graph.
File Type and operations
Major functions of OS in respect of File system
File Access Mechanisms and Space Allocation
Security and Protection
Program and system Threats
LINUX OPERATING SYSTEM: Architecture and basic commands
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
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top nidhi software solution freedownloadvrstrong314
This presentation emphasizes the importance of data security and legal compliance for Nidhi companies in India. It highlights how online Nidhi software solutions, like Vector Nidhi Software, offer advanced features tailored to these needs. Key aspects include encryption, access controls, and audit trails to ensure data security. The software complies with regulatory guidelines from the MCA and RBI and adheres to Nidhi Rules, 2014. With customizable, user-friendly interfaces and real-time features, these Nidhi software solutions enhance efficiency, support growth, and provide exceptional member services. The presentation concludes with contact information for further inquiries.
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Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
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In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
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Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
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2. Directory Structure
How to store files?
There are typically thousands, millions, or billions of files within computer storage.
Files are stored on random access storage devices.
Storage devices store file system by partitioning disks, each partition is called as
slices or minidisks.
Entity containing file system usually known as volume.
Volume may be subset of device, whole device or multiple devices linked together
Each volume contains a file system must also contain information about files in
system. This information is in device directory or volume table of contents.
Directory entry contains information about name, location, size, and type for all
files on that volume.
3.
4.
5. Directory overview
Directory can be defined as the listing of the related files on the disk. The directory
may store some or the entire file attributes.
Several operations are performed on directory.
1. Create a file: New files to be created and added to the directory.
2. Search for a file: we can able to search a directory structure to find the entry for
particular file.
3. Delete a file: when file is not needed we will able to remove it from directory.
4. List a directory: list the files in the directory and contents of the directory entry for
each file in the list.
5. Rename a file: changing the name of file according to contents of file.
6. Traverse the file system: Access every directory and every file within directory
structure.
6. Single level directory
The simplest method is to have one big list of all the files on the disk.
The entire system will contain only one directory which is supposed to mention
all the files present in the file system.
The directory contains one entry per each file present on the file system
MSDOS, UNIX
This type of directories can be used for a simple system.
7. Single level directory
Advantages
1. Implementation is very simple.
2. If the sizes of the files are very small then the searching becomes faster.
3. File creation, searching, deletion is very simple since we have only one directory.
Disadvantages
1. We cannot have two files with the same name.
2. The directory may be very big therefore searching for a file may take so much time.
3. Protection cannot be implemented for multiple users.
4. There are no ways to group same kind of files.
5. Choosing the unique name for every file is a bit complex and limits the number of
files in the system because most of the Operating System limits the number of
characters used to construct the file name.
8. Two level directory
In two level directory systems, we can create a separate directory for each user.
There is one master directory which contains separate directories dedicated to each
user.
For each user, there is a different directory present at the second level, containing
group of user's file.
The system doesn't let a user to enter in the other user's directory without
permission.
10. Two level directory (Cont.)
Characteristics of two level directory system
1. Each files has a path name as /User-name/directory-name/file name
2. Different users can have the same file name.
3. Searching becomes more efficient as only one user's list needs to be traversed.
4. The same kind of files cannot be grouped into a single directory for a particular
user.
5. Every Operating System maintains a variable as PWD which contains the present
directory name (present user name) so that the searching can be done
appropriately.
11. Tree Structured Directory
Any directory entry can either be a file or sub directory.
Tree structured directory system overcomes the drawbacks of two level directory
system. The similar kind of files can now be grouped in one directory.
Each user has its own directory and it cannot enter in the other user's directory.
However, the user has the permission to read the root's data but he cannot write or
modify this. Only administrator of the system has the complete access of root
directory.
Searching is more efficient in this directory structure. The concept of current
working directory is used.
A file can be accessed by two types of path, either relative or absolute.
12. Tree Structured Directory
Absolute path is the path of the file with respect to the root directory of the
system
Relative path is the path with respect to the current working directory of the
system.
13. Acyclic Graph structured directories
The tree structured directory system doesn't allow the same file to exist in multiple
directories therefore sharing is major concern in tree structured directory system.
Sharing can be provided by making the directory an acyclic graph. In this system, two or
more directory entry can point to the same file or sub directory. That file or sub
directory is shared between the two directory entries.
These kinds of directory graphs can be made using links or aliases. We can have
multiple paths for a same file. Links can either be symbolic (logical) or hard link
(physical).
If a file gets deleted in acyclic graph structured directory system, then
1. In the case of soft link, the file just gets deleted and we are left with a dangling pointer.
2. In the case of hard link, the actual file will be deleted only if all the references to it gets
deleted.