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  1. or download this
    $ a.pl
sh: ./a.pl: usr/bin/perl: bad interpreter: No such file or directory
  2. or download this
    $ . a.pl
sh: =: command not found
sh: ./a.pl: line 3: syntax error near unexpected token `{'
sh: ./a.pl: line 3: `if ($count <= 20) {'
  3. or download this
    $ a.pl
./a.pl: line 2: =: command not found
./a.pl: line 3: syntax error near unexpected token `{'
./a.pl: line 3: `if ($count <= 20) {'