linux - How can I detect if some file in a subdir changed? -

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basically have big directory (>10gb)(each subdir has few other subdirs) , want sth files changes. can't go through files , check, because takes long , uses 90% of cpu :(.

this how looks basically:

dir dir/suba dir/suba/subasuba dir/suba/subasubb ... dir/subb dir/subb/subbsuba dir/subb/subbsubb ... dir/subc dir/subd ...

my thought this(file "test" in subbsuba chaged):

check dir  -> dir changed    -->check suba       -> suba didn't change    -->check subb       -> subb changed       --> check subbsuba           -> subbsuba changed              --> check files

but sadly change of file effects modification date of direct parent directory :(

as @aereaux pointed out need inotify, available in linux since 2.6.13. see http://en.wikipedia.org/wiki/inotify

there inotify-tools available command line usage well. http://techarena51.com/index.php/inotify-tools-example/


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