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UMASK — Set the file creation maskSets the file creation mask to MASK. If called as a function, it
returns the old value. If called as a subroutine and argument OLD
if it is supplied, it is set to the old value. See umask(2).
GNU extension
Subroutine, function
| CALL UMASK(MASK [, OLD]) | 
| OLD = UMASK(MASK) | 
| MASK | Shall be a scalar of type INTEGER. | 
| OLD | (Optional) Shall be a scalar of type INTEGER. |