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Shell Programming and Unix Utilities

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Shell Programming and Unix Utilities. Creating Shell Scripts. Variables Arguments and Expressions. Shell I/O and Debugging. Testing Conditions and Control ...

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Shell Programming and Unix UtilitiesPage 1Shell Programming and Unix UtilitiesCreating Shell ScriptsVariables Arguments and ExpressionsShell I/O and DebuggingTesting Conditions and Control Statementstest if case while until for break continueExit StatusCommand SubstitutionRegular Expressions and Utilitiesgrep wc touch awk tr sort gtbl groff ghostviewcut head tail sed gnuplotPage 2Shell Scripts (35.2)Advantages of schell scripts.Can very quickly setup a sequence of commands toavoid a repetitive task.Can easily make several programs work together tomeet a set of goals.Disadvantage of shell scripts.Little support for programming in the large.Shell scripts are much slower since they areinterpreted.Page 3What Shell to Use? (27.3)The csh (C) shell and its derivative (tcsh) arerecommended for use at the command line.The sh (Bourne) shell and its derivatives (kshbash) are recommended for writing shell scripts.All shell script examples are given using the Bourneshell syntax.Page 4Finding Information about the BourneShell and Its CommandsType man <command> where <command> isthe Bourne shell command of interest.Type man sh and look in the manual page.Look up information in the text or use othertexts.See me or the TA.Page 5Creating a Shell Script (35.1 36.2)General convention is to use a .sh extension(<name>.sh) for shell scripts.Type in the first line of each shell script file:#!/bin/shType in comments after this to indicate thepurpose of the shell script.# This shell script is used to create a new# schema.Change the permissions on the schell script so itcan be executed by typing the name of the file.chmod +x <name>.shPage 6Printing a Line to Standard OutputUse the echo command to print a line to stdout.form: echo <zero or more values>exs:echo Hello World!echo Please enter a schema name:Page 7Implementation of EchoPage 8Shell Variables (35.9)Are just used and not declared.Can be assigned values. Note that there can be noblanks before or after the ...

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