UNIX in a Nutshell: System V Edition

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The Bourne Shell and Korn Shell
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umask

umask [nnn]

Display file creation mask or set file creation mask to octal value nnn. The file creation mask determines which permission bits are turned off (e.g., umask 002 produces rw-rw-r--). umask is also a UNIX command (see Section 2).


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