coreutils: Access permission tests

 
 16.3.2 Access permission tests
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 These options test for particular access permissions.
 
 ‘-g FILE’
      True if FILE exists and has its set-group-ID bit set.
 
 ‘-k FILE’
      True if FILE exists and has its “sticky” bit set.
 
 ‘-r FILE’
      True if FILE exists and read permission is granted.
 
 ‘-u FILE’
      True if FILE exists and has its set-user-ID bit set.
 
 ‘-w FILE’
      True if FILE exists and write permission is granted.
 
 ‘-x FILE’
      True if FILE exists and execute permission is granted (or search
      permission, if it is a directory).
 
 ‘-O FILE’
      True if FILE exists and is owned by the current effective user ID.
 
 ‘-G FILE’
      True if FILE exists and is owned by the current effective group ID.