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  1. or download this
    $ perl -e '@x=qw(foo 18);sub mkdir{CORE::mkdir($_[0],$_[1])};mkdir(@x)
+';ls
2
  2. or download this
    $ perl -e '@x=qw(foo 18);sub mkdir{CORE::mkdir($_[0],$_[1])};&mkdir(@x
+)';ls
foo
  3. or download this
    $ perl -e '@x=qw(foo 18);&mkdir(@x)';ls
Undefined subroutine &main::mkdir called at -e line 1.