How to find the username associated with a given UID
In Unix based systems, obviously...
I was curious one day to find where do some of the queued e-mail messages on a server originate from and since qmail only outputs something like "qmail x invoked by uid y" (where x and y are numbers obviously) I had to find out which user corresponds to y. After fiddling for a while without getting anywhere I resorted to asking around. And as usual the answer came quick from a good friend:
grep y /etc/passwd
Hmmm. Magic!
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