NAME

umask − set file-creation mode mask

SYNOPSIS

umask [ ooo ]

DESCRIPTION

The user file-creation mode mask is set to ooo. 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 ooo is omitted, the current value of the mask is printed with four octal digits.  The first digit, a zero, specifies that the output is expressed in octal. 

Umask is recognized and executed by the shell. 

Note that the file creation mask does not affect the set-user-ID, set-group-ID, or "sticky" bits. 

SEE ALSO

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

Hewlett-Packard Company  —  May 11, 2021