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Let's say you have a set of files. Some are writable by you; others are read-only. You want to give people in your group the same permissions you have -- that is, they can write writable files but can only read the read-only files. It's easy with an underdocumented feature of chmod:
% chmod g=u *
That means "for all files (*), set the group permissions (g) to be the same as the owner permissions (u)." You can also use the letter o for others, which is everyone who's not the owner or in the owner's group. Section 50.2 explains these categories.
If your chmod has a -R (recursive) option, you can make the same change to all files and directories in your current directory and beneath. If you don't have chmod -R, use this find (Section 9.9):
% find . -exec chmod g=u {} \;-- JP
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| 50.5. Using chmod to Change File Permission |  | 50.7. Protect Important Files: Make Them Unwritable |
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