umask—sets file-creation mode mask for permissions

umask [ ooo ]

The user file-creation mode mask is set to 000. The three octal digits refer to read/write/execute permissions for owner, group, and other, respectively. The value of each specified digit is subtracted from the corresponding ''digit'' specified by the system for the creation of a file. For example, umask 022 removes write permission for group and other (files normally created with mode 777 become mode 755; files created with mode 666 become mode 644). If 000 is omitted, the current value of the mask is printed. umask is recognized and executed by the shell.

Example A.53. 
1   umask
2   umask 027

EXPLANATION

  1. Displays the current file permission mask.

  2. The directory permissions, 777, ...

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