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I'm using OS X Snow Leopard. I have a web application hosted locally in the web server folder with _www user and _www group.

I'm unable to edit those files with my local user, who is part of the group admin.

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This one sounds familiar: Unable to edit files on Macbook pro. Permission denied – slhck Feb 7 '12 at 15:29
So is the one above your question? – slhck Feb 7 '12 at 15:50
no I commented on it because it was very similar to mine. – jini Feb 7 '12 at 16:03
up vote 5 down vote accepted

The best option is to add your local user to the _www group ; that's what groups are there for. Being administrator doesn't mean you own other user's files. You could of course override this using sudo, but this is bad.

Bottom line: add your local user to the _www group and make the files in the web server folder group-writeable ( chmod -R g+w /path/to/we/server/folder/ )

See this answer on how to add your local user to the _www group.

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