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Say I have a group called mygroup and I want it to have a permission of rwx (777) to the folder /var/www . How do I do this? What is the appropriate command to do this in ubuntu?

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chgrp -R mygroup /var/www
chmod -R g+rwxs /var/www

CAUTION: This will overwrite your group ownership and permissions of all files under /var/www.

The 'g' will cause newly-created files or directories to take the same group as the directory they are created in. This is needed to preserve the ownership of newly-created files and directories.

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sudo chmod 777 /var/www

The sudo part of the command is just providing super user access. This needs to be run from a terminal session.

sudo chmod 777 /var/www -R

will apply to all files and sub folders recursively, underneath /var/www

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You probably shouldn't do this though. If your web server gets compromized, your /var/www contents can be replaced. Use 775 with the oner and group something else than www-data. –  BillThor Nov 8 '11 at 2:14

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