$ a.pl
sh: ./a.pl: usr/bin/perl: bad interpreter: No such file or directory

##</code><code>##

$ . a.pl
sh: =: command not found
sh: ./a.pl: line 3: syntax error near unexpected token `{'
sh: ./a.pl: line 3: `if ($count <= 20) {'

##</code><code>##

$ 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) {'