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Shell Scripting

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Why Shell Script? Its the simplest form of programming. Shell scripting is exactly the same as. you use with an interactive shell session. ...

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Shell ScriptingPage 1Shell ScriptingSeptember 6 2005Page 2Whats a Shell?The most basic user interface.Command Line WindowsDOS Window WindowsTerminal UnixSometimes Console UnixPage 3Common Unix Shells sh the bourne shell Stephen Bourne AT&T Bell Laboratories csh the C programmers shell Bill Joy University of California bash Bourne Again Shell Richard Stallman Free Software Foundation tcsh an updated csh t is for TENEX a old system eventually boughtby DEC in the late 70s. ksh the korn shell David Korn AT&T Bell LaboratoriesPage 4Why Your Default Shell is tcshtcsh has very flexible completion andvariable substitution routines builtin. Examples: tab completion spellingcorrection variablesThe Sun Solaris operating systemdefaults to it.Page 5.cshrc And .bashrc Files Modify your shell by editing your .cshrc (tcsh)or .bashrc (bash) Both are shell scripts! $PATH $LD_LIBRARY_PATH aliasesPage 6Why Shell Script?Its the simplest form of programming.Shell scripting is exactly the same asyou use with an interactive shell session.Greatly reduces time spent doingrepetitive commands.EASY!Page 7Why tcsh is Bad for ScriptingSince most of the Unix system is builtupon the sh shell bash is a moresensible choice.csh Programming Considered Harmfulhttp://www.tac.nyc.ny.us/mirrors/tc shbook/cshwhynotPage 8Getting Started with bash At any Unix prompttype bash. To start programs do itlike you would in tcsh. Differences betweentcsh and bash aremainly in variabledeclaration I/Obash2.95b $$ lsbincodeDocumentstmp$ emacsPage 9Variables Any word can beused but typicallyvariables are writtenin UPPER CASE. After declaring thevariable you referto it by using adollar sign ($).$ TEST=1$ echo $TEST1$ echo $SHELL/bin/bash$ printenvTEST=1SHELL=/bin/bashPage 10Flow Control if; then; else; fi while; do; done for; do; doneif TEST = 1 ]; then<do this>else<do this instead>fifor i in 123; do<do this to $i>donePage 11Putting This into a Script Begin with shabangThis identifie ...

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