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    <p>Parsing this:</p> <pre><code>ps aux | grep [-i] $ProcessName | wc -l </code></pre> <p>...is probably your best bet. Here's a short script that does what you're after:</p> <pre><code>#!/bin/bash PROCESS=myapp number=$(ps aux | grep $PROCESS | wc -l) if [ $number -gt 0 ] then echo Running; fi </code></pre> <p><strong>EDIT:</strong> I initially included a <code>-i</code> flag to <code>grep</code> to make it case insensitive; I did this because the example program I tried was <code>python</code>, which on Mac OS X runs as <code>Python</code> -- if you know your application's case exactly, the <code>-i</code> is not necessary.</p> <p>The advantage of this approach is that it scales with you -- in the future, if you need to make sure, say, <em>five</em> instances of your application are running, you're already counting. The only caveat is if another application has your program's name in its command line, it might come up -- regular expressions to <code>grep</code> will resolve that issue, if you're crafty (and run into this).</p> <p>Research the Darwin man pages for <a href="http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/ps.1.html" rel="noreferrer"><code>ps</code></a>, <a href="http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/grep.1.html" rel="noreferrer"><code>grep</code></a>, and <a href="http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/wc.1.html" rel="noreferrer"><code>wc</code></a>.</p>
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    1. USJed Smith
    1. USJed Smith
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    1. COThanks. This worked with one exception: it has to be `-gt 1` rather than `0`, because the `grep` command from the Bash script itself gets counted as one of the lines in the `ps aux`, at least in my preliminary tests.
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      1. USChris Redford
    2. COI like to add a `grep -v grep` to the pipeline before the `wc`. That way, the grep command gets excluded from the number of matches found.
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      1. USJacob
    3. CODoes it work with really long filenames and paths? Especially if they are similar in the beginning?, eg. my-long-filename-that-is-really-stupid-of-file-1, my-long-filename-that-is-really-stupid-of-file-2... I bet it doesn't, at least not on both Linux and Mac OS X, using the same arguments to ps...
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      1. USLudvig A. Norin
 

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