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    <p>You are on the right track. To fire a python script every <em>n</em> hours, do this:</p> <pre><code>* */n * * * python /home/pi/Desktop/myProg.py </code></pre> <p>That's it. Make sure that you are editing the sudo level crontab, which is accessed via <code>sudo crontab -e</code>.</p> <p>Your code would actually have the script run at 2 am every day - it technically says "run whenever the hour is equal to <code>2</code>". <code>* */n * * *</code> says "run whenever the hour is divisible by <code>n</code>". A GREAT resource on crontab can be found here: <a href="http://kvz.io/blog/2007/07/29/schedule-tasks-on-linux-using-crontab/" rel="nofollow noreferrer">Schedule tasks on Linux using crontab</a></p> <p>Logging the output is also easy. If you had a log file on your desktop called myLog.log, you would add <code>&gt;&gt; /home/pi/Desktop/myLog.log</code> to end of the crontab entry. That would make the entry look like this:</p> <pre><code>* */2 * * * python /home/pi/Desktop/myProg.py &gt;&gt; /home/pi/Desktop/myLog.log </code></pre> <p><strong>EDIT</strong> (thanks to @Iamreck): Another option for outputting to a file is with sys.stdout. This would accomplish the same goal. To do it this way, add the following to your Python script:</p> <pre><code>import sys sys.stdout = open("myLog.log","w") sys.stderr = open("myLogErr.log","w") print "stdout test" </code></pre> <p>You would also have to change the working directory to your Desktop when doing this, and this can be done with the top answer at <a href="https://stackoverflow.com/questions/1432924/python-change-the-scripts-working-directory-to-the-scripts-own-directory">this SO post</a></p>
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    1. COUse `sudo crontab -e` if and only if you want the job to run as `root`. Also, if you `chmod +x` the script (and make sure it has a proper `#!` line at the top), you can execute it directly rather than passing it as an argument to the `python` command.
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    2. COAnother point: I don't use `crontab -e`; it's too easy to make incorrect edits and not be able to get back to the previous version. I keep my crontab in a separate file under a source control system, and feed the file to `crontab`.
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