umask(1)                   DG/UX 4.30                    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) in the Programmer's Reference
          for the DG/UX System (Volume 1)






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