38 characters:

$_="$tftpdir/$archive";-d||mkdir$_,755

Or if you can assume that the user has a decent umask value set, we're down to 34:

$_="$tftpdir/$archive";-d||mkdir$_

Oh, sorry, I must be in the wrong place, could anyone direct me to the green?

In reply to Re: mkdir unless dir already exists. by mugwumpjism
in thread mkdir unless dir already exists. by c

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