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For instance, I don't want either program to find files that end in *.pyc. I'm sure I can do this somehow using regexes or globs, but is there a way to make locate just ignore the files altogether? It's highly doubtful that I would ever want to search for a pyc file.

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In updatedb.conf, uncomment the PRUNENAMES line and add the extension .pyc. On my Ubuntu system by default it reads:

# PRUNENAMES=".git .bzr .hg .svn"

Change it to

PRUNENAMES=".git .bzr .hg .svn .pyc"

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typo -- second PRUNENAMES has a pair of doublequotes at the beginning. –  quack quixote Oct 2 '09 at 16:23
    
Fixed-thanks, quack. –  CarlF Oct 3 '09 at 2:10
    
As it turns out, PRUNENAMES only works for directories, not for file names. –  Jason Baker Nov 17 '09 at 15:26
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