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POComparison to exit status not working
 

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    <p>I'm trying to customize my bash prompt. I want it so change color if I enter a command that doesn't exist, or for some other reason fails. I'm fairly new with coding bash scripts, so I looked at some other scripts so get some help, but something's not working. Here's my code:</p> <pre><code>export PROMPT_COMMAND=" PS1='` if [ $? -eq 0 ]; then echo ' \[\033[00;32m\]┌─\[\033[00;35m\]\u\[\033[01;32m\]@ \[\033[00;35m\]\h\n\[\033[00;32m\]└─\[\033[01;32m\] (\[\033[01;35m\]\W\[\033[01;32m\])\[\033[00;32m\]\$'; else echo ' \[\033[00;31m\]┌─\[\033[00;35m\]\u\[\033[01;31m\]@ \[\033[00;35m\]\h\n\[\033[00;31m\]└─\[\033[01;31m\] (\[\033[35m\]\W\[\033[31m\])\[\033[00;31m\]\$'; fi`\[\033[0m\]'" </code></pre> <p>I do not have any linebreaks in the actual code, since that would be messy with PS1, I just added them to make the code easier to read. </p> <p>So, I want to compare the exit status, <strong>$?</strong>, to <em>0</em>. For some reason the variable $? doesn't change at all in the script. It just remains <em>0</em>, so the first condition is always true, even when I issue a faulty command. I've tried adding <em>echo $?</em> to the code before the if-case, and this always returns 0, even if issuing <em>echo $?</em> as a command to the terminal returns something different. I've tried copying working code into mine, but that doesn't solve it either. Also, it worked when I used <strong>'</strong> as the outer citation and <strong>"</strong> as the second. I changed this because the script wouldn't accept <strong>(</strong> as a character otherwise.</p> <p>Any ideas why this is and how I can fix it?</p>
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