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    <p>You can use <a href="http://en.wikipedia.org/wiki/Launchd" rel="noreferrer">launchd</a> for that purpose. Launchd can be configured to automatically launch a program when a file path is modified.</p> <p>For example the following launchd config plist will launch the program <code>/usr/bin/logger</code> when the desktop folder of my user account is modified:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt; &lt;plist version="1.0"&gt; &lt;dict&gt; &lt;key&gt;Label&lt;/key&gt; &lt;string&gt;logger&lt;/string&gt; &lt;key&gt;ProgramArguments&lt;/key&gt; &lt;array&gt; &lt;string&gt;/usr/bin/logger&lt;/string&gt; &lt;string&gt;path modified&lt;/string&gt; &lt;/array&gt; &lt;key&gt;WatchPaths&lt;/key&gt; &lt;array&gt; &lt;string&gt;/Users/sakra/Desktop/&lt;/string&gt; &lt;/array&gt; &lt;/dict&gt; &lt;/plist&gt; </code></pre> <p>To activate the config plist save it to the LaunchAgents folder in your Library folder as "logger.plist".</p> <p>From the shell you can then use the command <code>launchctl</code> to activate the logger.plist by running:</p> <pre><code>$ launchctl load ~/Library/LaunchAgents/logger.plist </code></pre> <p>The desktop folder is now being monitored. Every time it is changed you should see an output in the system.log (use Console.app). To deactivate the logger.plist, run:</p> <pre><code>$ launchctl unload ~/Library/LaunchAgents/logger.plist </code></pre> <p>The configuration file above uses the <code>WatchPaths</code> option. Alternatively you can also use the <code>QueueDirectories</code> option. See the <a href="http://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man8/launchd.8.html" rel="noreferrer">launchd</a> man page for more information.</p>
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    1. POIs there a command like "watch" or "inotifywait" on the Mac?
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    1. COis there a way to have it monitor change in file content as well as the file path?
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    2. COI don't think so. You can use [opensnoop](https://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man1/opensnoop.1m.html) for that purpose.
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