umask - set file-creation mode mask
umask [ ooo ]
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.
umask is recognized and executed by the shell.
umask can be included in the user's .profile or .login file (see
profile(4) and cshrc(4)) and invoked at login to automatically set the
user's permissions on files or directories created. The default for all
logins is set in /etc/default/login before the user's shell is started.
chmod(1), sh(1), chmod(2), creat(2), umask(2), cshrc(4), profile(4)
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