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  1. or download this
     $ cat whichperl.pl
#!/usr/bin/perl

printf "operating system: %s\n executable: %s\n", $^O,  $^X, ;
  2. or download this
     
$ perl whichperl.pl
operating system: linux
...
$ ./whichperl.pl
 operating system: linux
 executable: /usr/bin/perl
  3. or download this
    $ perl whichperl.pl
 operating system: freebsd
 executable: /usr/local/bin/perl