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until (! -f "$md");

my $limit = 99999;
my $md;
...
    $tmpname = int(rand($limit));                #$tmpname = convert t
+o integer random number between 0 and $limit (99999)
    $md      = "$TMPDIR/runitout_$tmpname";        #$md = "$TMPDIR/run
+itout_$tmpname" concatinated values of $TMPDIR (not listed) the strin
+g "/runitout_" and the value of $tmpname
} until (! -f "$md");                             #until file $md does
+ not exist