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  • 1. LINUX
  • 2. WHAT IS LINUX ?FreeLinux in a Unix-like computer operating system.Linux is a very popular open source operating system.Linux is the software on a computer that enables applications and thecomputer operater to access the devices on the computer to perform desired functions.
  • 3. HISTORY OF LINUX The unix operating system was implemented in 1969, by ken Thompson ,Dennis Ritchi, Douglas Mcllroy and Joe Ossanna. In Sept 1991, Linus Torvalds, a second year student of Computer Science at the University of Helsinki, developed the preliminary kernel of Linux, known as Linux version 0.0.1Ken Thompson and Dennis Ritchie Linus Torvalds
  • 4. Linux is Virus Free!! Linux is "virus-free"
  • 5. WHY LINUX IS VIRES FREE?Most of the viruses are in the for of executable files Thus the viruses will be able to execute an
  • 6. WHAT IS KERNEL?Kernel is used in UNIX like systems and is considered to be the heart of the operating system
  • 7. TYPE OF KERNELMICROKERNEL(takes the approach of only managing cpu, memory &ipc).MONOLITHIC KERNEL(opposite to microkernel).HYBRID KERNEL(have ability to pick superviser mode &user mode).
  • 8. KERNEL ACTIVITIESThe Kernel task manager allows tasks to run concurrently.Managing the computer resources.Kernel is responsible for Process management.Responds to system calls.
  • 9. WHAT IS LINUX SHELL ?Linux shell is a user interface used for executing the commands.Shell is a program the user uses for executing the commands. In UNIX
  • 10. TYPES OF LINUX SHELLSBourne Shell(Steve Bourne).C Shell(Bill Joy).TC Shell.Korn Shell(David Korn).Bourne-Again Shell(Brian Fox and Chet Ramey).
  • 11. Linux Command BasicsTo execute a command, type its name and argumen ls -l /etc Command name Arguments Options (flags)
  • 12. DEADLY COMMANDS IN LINUXrm -rf / – Deletes Everything!:(){ :|: & };: – Fork Bombmkfs.ext4 /dev/sda1 – Formats a Hard Drivecommand > /dev/sda – Writes Directly to a Hard Drivedd if=/dev/random of=/dev/sda – Writes Junk Onto amv ~ /dev/null – Moves Your Home Directory to a Black
  • 13. ADVANTAGES OF LINUXCOST.LINUX IS EASY TO INSTALL!.LINUX IS VERY STABLE.SECURITY.CHOICE(Freedom).SOFTWARE.HARDWARE.LINUX TYPICALLY DOES NOT SLOW DOWN
  • 14. DISADVANTAGES OF LINUXUNDERSTANDING.MANY WINDOWS PROGRAMS WILL NOT RUN IN LINUX..ALTERNATIVE PROGRAMS.MORE TECHNICAL ABILITY NEEDED.
  • 15. THANK YOU