NMDDRU-4

Not necessarily:

UNIX- and Linux-based systems: A quoted string that defines the octal mode that is passed to chmod. If the value is specified as a quoted string, it will work exactly as if the chmod command was passed. If the value is specified as an integer, prepend a zero (0) to the value to ensure it is interpreted as an octal number. For example, to assign read, write, and execute rights for all users, use "0777" or "777"; for the same rights, plus the sticky bit, use "01777" or "1777".
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