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 Documented in Volume 1 of the UNIX Programmers Manual.

 % chmod o-w file

   -or-

 % chmod 750 file

  denies write permission to 'others' (anyone but you and your group)
  for the file named 'file' in the current directory.

 % chmod +x file

   -or-

 % chmod 755 file

  makes 'file' executable to everyone.

 % chmod ugo+rw dirname/filename
  makes dirname/filename readable and writeable by you, your
  group, and others (i.e. everyone).

 % chmod ugo+r .
  will allow read permission of the current directory.

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