umask(1)                       DG/UX R4.11MU05                      umask(1)


NAME
       umask - set file-creation mode mask

SYNOPSIS
       umask [ ooo ]

DESCRIPTION
       The user file-creation mode mask is set to screen permissions for
       files and directories created by the user.  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 when it creates a file (see creat(2)).  For example,
       umask 022 removes group and others write permission; files normally
       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 (sh(1)) and the C shell
       (csh(1)).

       Note that the shell and any programs running under it always create
       files with 666 permissions. This means that if you need execution
       permissions, you must add them explicitly with chmod.

       Shell programs must have read and execute permissions in order to
       run.


EXAMPLES
       Under the shell, the user file-creation mode mask has this effect:

              Umask     Mode of all files created

              000       666

              101       666

              102       664

              026       640

SEE ALSO
       chmod(1), csh(1), sh(1).
       chmod(2), creat(2), umask(2)


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