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POCommand aliases in my script
 

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  1. POCommand aliases in my script
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    <p>I am creating a script for copying files or directory with a date attached to its name, for example if the file name is <code>test</code> it will be <code>test-20130901.bkup</code></p> <p>and this is my script</p> <pre><code>#!/usr/bin/bash set -x getopts fd TYPE [ $TYPE = "d" ] &amp;&amp; alias cp="cp -r" backup_error() { echo "${0##*/}: $1" exit -1 } typeset -r FROM_DIR=$2 TO_DIR=$3 if [ ! -e $FROM_DIR -a ! -d $FROM_DIR ] || [ ! -e $TO_DIR -a ! -d $TO_DIR ] then backup_error "One of the directories isn't exist or it maybe a file"; fi typeset -r DATE=$(date "+%Y%m%d") for filename in $FROM_DIR/* do if [ -$TYPE $filename ] then cp $filename $TO_DIR/${filename##*/}-$DATE.bkup fi done unalias cp </code></pre> <p>In the script I check if the user wants to run the script on files only or on directories only. <code>-f</code> for files only <code>-d</code> for directories only</p> <p><code>[ $TYPE = "d" ] &amp;&amp; alias cp="cp -r"</code>, this line to check if the script runs for directory I must use <code>cp -r</code> so I make an alias for <code>cp</code> to be <code>cp -r</code> </p> <p>but when I use <code>set -x</code> to debug I find the when a user use <code>-d</code> option the <code>cp</code> command in the <code>if</code> still the original one not the alias.</p> <p>Debugging:</p> <pre><code>&gt; ./backup.sh -d . . + getopts fdb TYPE + '[' d = d ']' + alias 'cp=cp -r' + typeset -r FROM_DIR=. TO_DIR=. + '[' '!' -e . -a '!' -d . ']' + '[' '!' -e . -a '!' -d . ']' ++ date +%Y%m%d + typeset -r DATE=20130901 + '[' -d ./backup.sh ']' + '[' -d ./dir1 ']' + cp ./dir1 ./dir1-20130901.bkup cp: ./dir1: is a directory + '[' -d ./file1 ']' + '[' -d ./file2 ']' + '[' -d ./test.sh ']' + unalias cp </code></pre>
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    1. USMahmoud Emam
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    1. CO[ $TYPE = "d" ] && __cp="cp -r" || __cp="cp" and then .... $__cp $filename $TO_DIR/${filename##*/}-$DATE.bkup just throw out the aliasing/unaliasing approach ))
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    2. COThis is fine, but do you know any justification for what happened?
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      1. USMahmoud Emam
 

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