in reply to mkdir usage

  1. if (! -d abc) { should be if (! -d 'abc') {

    use warnings; would have caught that:

    C:\test>perl -wE"if( -d abc ) { say 'hi' }"
Unquoted string "abc" may clash with future reserved word at -e line 1
+.
Name "main::abc" used only once: possible typo at -e line 1.
-d on unopened filehandle abc at -e line 1.

    [download]
  2. You cannot create a directory if a file of the same name already exists.
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In Section Seekers of Perl Wisdom