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Published byChloe Tate Modified over 8 years ago
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Unix – Linux CS3353 Ssystem Administration
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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.
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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.
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UNIX By 1973, it was a complete Written using the C program language. – Multi user – Multi task – Multi processor
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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).
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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.
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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.
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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.
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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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