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01-lec-shell - The Shell Intermediate System Administration...

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The Shell Intermediate System Administration Spring 2010
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What is the shell? A program; your gateway into any Unix system Allows you to inspect, manipulate, add/remove files and parts of the system Allows you to run other programs and control how they run A compact programming environment to allow automation of many tasks (sort of like DOS batch files)
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In the beginning, there was sh. . . sh (what would become the Bourne shell) is the original shell first developed for UNIX in 1971 More commonly used today are derivatives of the Bourne shell (such as bash and ksh) and csh (the C shell, written by Bill Joy, at the time a masters student at Cal) and its derivative tcsh Most examples in this course will use bash syntax, but nothing we do will be impossible in any other shell
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Diving in: Basic Commands Demonstration of: cd - change directory ls - list directory pwd - print working directory mkdir - make (empty) directory cp - copy a file mv - move/rename a file rmdir - remove an empty directory rm - remove a file
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Looking for Things grep : used to search within files for certain patterns (called regular expressions , or regexes ) find
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