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Unix – Linux

Unix – Linux. CS3353 Ssystem Administration. OS. The Operating System Acts as the interface to all software, hardware, and users of a computer. Requires a file system for organizing files

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Unix – Linux

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  1. Unix – Linux CS3353 Ssystem Administration

  2. OS • The Operating System • Acts as the interface to all software, hardware, and users of a computer. • Requires a file system for organizing files • Must maintain its viability to prevent other programs, hardware, users, etc, from impeding its operation. Unix and its variants will accomplish the above.

  3. UNIX • Consists of core software known as the kernel • The kernel acts to share resources of the system with all running processes. • A process is a collection of resources associated with a running program.

  4. UNIX • By 1973, it was a complete • Written using the C program language. • Multi user • Multi task • Multi processor

  5. UNIX Variants • There are many variants of UNIX. • BSD (1977) • AT&T System V (1983) • Linux (1991, Linus Torlvalds, Helsinki Finland) • Mac OS X is a UNIX based variant (1999).

  6. UNIX • Multi-user • The user accesses the computer in an environment that is separated from other users sharing the computer’s resources. • Access is through a verification process known as logging-in: Enter a user-id and password. • The OS creates an environment known as the “shell” for the user after the login is complete.

  7. The Unix/Linux Shell • A command line interpreter • The shell is tagged with the user’s ID. • The user can have multiple independent shells running simultaneously.

  8. Shell Types • sh = Bourne shell • csh = C-shell • ksh = korn shell, an enhanced c-shell. • bash = enhanced Bourne shell. The new standard for shell scripting.

  9. The UNIX-Linux OS • The Unix/Linux OS consists of: • The kernel – the main controlling program that is started at boot time. • Processes that support the kernel and all other activity • The File system • Utilities

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