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 other, 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 write permission for group and other (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. 

umask is recognized and executed by the shell. 

umask can be included in the user’s .profile (see profile(4) ) and invoked at login to automatically set the user’s permissions on files or directories created. 

SEE ALSO

chmod(1), sh(1), chmod(2), creat(2), umask(2), profile(4)

Sun Microsystems  —  Last change: 5 Jul 1990