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Shell Scripting Netsoc Advanced Tutorial Escaping What if we want to display $meh ? 1 > echo \$meh$meh 2 $meh$meh 3 > \ says to ignore the special meaning of the next character ...

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Netsoc Advanced Tutorial Shell Scripting by Brian Brazil bbrazil@netsoc.tcd.ie Shell Scripting Netsoc Advanced Tutorial Goal To learn how touse standard Unix tools to process text and manipulate files. Brian Brazil 2 Shell Scripting Netsoc Advanced Tutorial Assumptions You have access to a Unix bash shell. Yourecurrently sitting ona Debiansystem. Brian Brazil 3 Shell Scripting Netsoc Advanced Tutorial chsh What if youre not using bash? 1 >chsh-s/bin/bash 2 > Logoutandlogback in Brian Brazil 4 Shell Scripting Netsoc Advanced Tutorial The Prompt What you should be looking at: 1 bbrazil@spoon:˜$ This is controlled by PS1: 1 bbrazil@spoon:˜$ echo $PS1 2 ${debian_chroot: +($debian_chroot)}u@h:w$ 3 bbrazil@spoon:˜$PS1=Au@h:w$ 4 19:38 bbrazil@spoon:˜$ Brian Brazil 5 Shell Scripting Netsoc Advanced Tutorial Variables Bash variables are strings. We assign with = and evaluate with $ . 1 >meh=bah 2 > echo $meh 3 bah 4 > echo ${meh}hmm 5 bahhmm 6 > Brian Brazil 6 Shell Scripting Netsoc Advanced Tutorial Escaping What if we want to display $meh ? 1 > echo $meh$meh 2 $meh$meh 3 > says to ignore the special meaning of the next character. When placed at the end of line, will join the current line and the next line. Brian Brazil 7 Shell Scripting Netsoc Advanced Tutorial Single Quoting 1 > echo $meh 2 bah 3 > Single quotes treat everything inside literally. Brian Brazil 8 Shell Scripting Netsoc Advanced Tutorial Double Quoting 1 > echo "$meh" 2 bah 3 > Double quotes only process$and . Useful for spaces in filenames. Brian Brazil 9 Shell Scripting Netsoc Advanced Tutorial Backticks 1 > echo whoami 2 bbrazil 3 > echo $(whoami) 4 bbrazil 5 > Runs the enclosed command and substitutes the result. Brian Brazil 10 Shell Scripting Netsoc Ad ...

Source: www.netsoc.tcd.ie

 

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