(coreutils.info.gz) Copying Permissions

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(coreutils.info.gz) Setting Permissions

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 27.2.2 Copying Existing Permissions
 -----------------------------------
 
 You can base a file's permissions on its existing permissions.  To do
 this, instead of using a series of `r', `w', or `x' letters 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.
 

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(coreutils.info.gz) Setting Permissions

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(coreutils.info.gz) Changing Special Mode Bits