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  1. or download this
      $ perl -E '$x = "txt"; sub ref {return $x . "r";}; say &ref($x);'
  txtr
  $ perl -E '$x = "txt"; sub ref {return $x . "r";}; say ref($x);'

  $
  2. or download this
    
  $ perl -wE '$x = "txt"; sub ref {return $x . "r";}; say &ref($x);'
...
    at -e line 1.

  $
  3. or download this
      $ perl -wE 'sub say {print "txt\n";}; &say("hello");'
  txt
  $ perl -wE 'sub say {print "txt\n";}; say("hello");'
  hello