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$ perl -e'printf "umask: %04o\n", umask; printf "mode: %04o\n", 0777; +printf "masked mode: %04o\n", 0777 & ~umask'
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my $old_umask = umask;
umask 0;
mkdir('test_dir', 0777);
umask $old_umask;
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chmod test_dir, 777


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