You don't have to pass a string to umask that represents an octal number - anything that's stored as a number, or can be converted to a number, is fine. 
umask 0777;
umask 511; # same, with decimal notation - but slightly confusing
my $u = 0777; 
$u &= $other_number;
umask $u; # also works

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In reply to Re: mkdir with variable mask by moritz
in thread mkdir with variable mask by kreetrapper

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