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I have the following command to delete files in a folder that are 15 days or older:

find /var/www/App/app/var/sessions* -mtime +15 -exec rm {} \;

what is the best way to speed this up and run it on the background? I heard rm is a pretty slow operation

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You can reduce the I/O priority of the operation. And you should not start one rm instance per file:

find /var/www/App/app/var/sessions* -mtime +15 -exec ionice -c3 rm {} +
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Most modern versions of find support -delete as a parameter, so you won't be launching any more processes; just use that instead of the -exec string. Running it under ionice as well won't let it tie up the hard drive.

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