Excursions With Find, Xargs, and Perl
It's a common sysadmin task to want to change permissions on all the files and subdirectories under a top-level directory. You could just use the '-R' switch to chmod, but what if your files and directories need different permissions?
One scenario that comes up is with shared directories - you have a directory tree that has to be writable by users in a specific group. To do this you want to set the group ID bit on all the directories, so that files created by an individual user are always writable by the entire group (this is numeric permission mode 2775). We want regular files to just have permissions 664. So we first need a way to differentiate files and directories - one easy way is with the find command, which as a bonus will also recurse into subdirectories for us. Here's our first crack at a solution - let's assume we have changed to the top-level directory we are interested in already:
find . -type f -exec chmod 664 {} \;
find . -type d -exec chmod 2775 {} \;
A word of warning -
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