NAME

umask − set file-creation mode mask

SYNOPSIS

umask [ 000 ]

DESCRIPTION

The user file-creation mode mask is set to 000. The three octal digits refer to read/write/execute permissions for owner, group, and others, respectively (see chmod(2) and umask(2)). The value of each specified digit is subtracted from the corresponding "digit" specified by the system for the creation of a file (see creat(2)). For example, umask 022 removes group and others write permission (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

umask 22

sets file-creation mode mask such that at file creation, the write bits will be zeroed out for group and other users, regardless of mode specification in create.

SEE ALSO

chmod(1), sh(1), chmod(2), creat(2), umask(2). 

Version 2.5  —  April 22, 1987