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(fileutils.info)Copying Permissions

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Copying Existing Permissions
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   You can base a file's permissions on its existing permissions.  To do
this, instead of using `r', `w', or `x' after the operator, you use the
letter `u', `g', or `o'.  For example, the mode
     o+g

adds the permissions for users who are in a file's group to the
permissions that other users have for the file.  Thus, if the file
started out as mode 664 (`rw-rw-r--'), the above mode would change it
to mode 666 (`rw-rw-rw-').  If the file had started out as mode 741
(`rwxr----x'), the above mode would change it to mode 745
(`rwxr--r-x').  The `-' and `=' operations work analogously.