umask(1)                                                       umask(1)

  umask

  NAME

    umask - set or report file mode creation mask

  SYNOPSIS

    umask [-S] [mask]

  DESCRIPTION

    The umask(1) command sets or reports the file mode creation mask for the
    current shell execution environment. The file mode creation mask is used
    to determine the initial value of a file's permissions when it is created.

    The following option is available:

    -S
        Report the file mode creation mask symbolically. If -S is not used,
        the output format is unspecified.

    The output format for -S is:

    "u=%s,g=%s,o=%s\n", owner perms, group perms, other perms

    The mask argument can be specified as either a symbolic mode, or
    (obsolescent) octal number. See the discussion of modes in the chmod(1)
    reference page. The file mode creation mask of the shell execution
    environment will be set according to the mask argument. For a symbolic
    mode value, the new value of the file mode creation mask will be the
    logical complement of the file permissions portion of the file mode
    specified as a symbolic mode.

    The output from an invocation of umask(1) without a mask argument can be
    used as input to another invocation of umask(1).

    If the mask argument is not given, umask(1) writes the value of the
    current file mode creation mask to standard output.

    To clear all write bits, you must use umask -- -w.

  SEE ALSO

    chmod(1)