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POWhat is the most elegant way to remove a path from the $PATH variable in Bash?
 

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  1. POWhat is the most elegant way to remove a path from the $PATH variable in Bash?
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    <p>Or more generally, how do I remove an item from a colon-separated list in a Bash environment variable?</p> <p>I thought I had seen a simple way to do this years ago, using the more advanced forms of Bash variable expansion, but if so I've lost track of it. A quick search of Google turned up surprisingly few relevant results and none that I would call "simple" or "elegant". For example, two methods using sed and awk, respectively:</p> <pre><code>PATH=$(echo $PATH | sed -e 's;:\?/home/user/bin;;' -e 's;/home/user/bin:\?;;') PATH=!(awk -F: '{for(i=1;i&lt;=NF;i++){if(!($i in a)){a[$i];printf s$i;s=":"}}}'&lt;&lt;&lt;$PATH) </code></pre> <p>Does nothing straightforward exist? Is there anything analogous to a split() function in Bash?</p> <p><strong>Update:</strong><br/> It looks like I need to apologize for my intentionally-vague question; I was less interested in solving a specific use-case than in provoking good discussion. Fortunately, I got it!</p> <p>There are some very clever techniques here. In the end, I've added the following three functions to my toolbox. The magic happens in path_remove, which is based largely on Martin York's clever use of <code>awk</code>'s RS variable.</p> <pre><code>path_append () { path_remove $1; export PATH="$PATH:$1"; } path_prepend () { path_remove $1; export PATH="$1:$PATH"; } path_remove () { export PATH=`echo -n $PATH | awk -v RS=: -v ORS=: '$0 != "'$1'"' | sed 's/:$//'`; } </code></pre> <p>The only real cruft in there is the use of <code>sed</code> to remove the trailing colon. Considering how straightforward the rest of Martin's solution is, though, I'm quite willing to live with it!</p> <hr> <p>Related question: <A href="https://stackoverflow.com/questions/273909/how-do-i-manipulate-path-elements-in-shell-scripts"><a href="https://stackoverflow.com/questions/273909/how-do-i-manipulate-path-elements-in-shell-scripts">How do I manipulate $PATH elements in shell scripts?</a></A></p>
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