mkdir "abc", "0777" or die "Can't mkdir abc: $!";
The second argument to mkdir expects a numerical value so providing a string means it will be interpreted as a number and the string "0777" is numerically different than the number 0777:
$ perl -le'print 0 + "0777"'
777
$ perl -le'print 0 + 0777'
511
$ perl -e'mkdir "testone", 0777 or die "Cannot mkdir testone because:
+$!"'
$ ls -dl testone
drwxr-xr-x 2 john john 4096 2012-12-20 21:12 testone
$ rmdir testone
$ perl -e'mkdir "testone", "0777" or die "Cannot mkdir testone because
+: $!"'
$ ls -dl testone
dr----x--t 2 john john 4096 2012-12-20 21:13 testone
$ rmdir testone
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