As far as I can see "mkdir -m" deliberately ignores the user's umask setting. perl's mkdir doesn't.

see umask and mkdir.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Why does unix mkdir and perl mkdir behave differently? by Joost
in thread Why does unix mkdir and perl mkdir behave differently? by tphyahoo

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