What's the command to use if I want to remove all the directories and files except 'a.gz' under a directory?

There isn't one. If you're using *nix, you could try this:

exec('find ! -name a.gz -maxdepth 1 -exec rm -rf {} \;');

Or something like that. If you're on Windows you'll need someone else... :-)

--
Richard Heyes
Employ me:
http://www.phpguru.org/cv

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