The $^O builtin variable will tell you.

From perldoc perlvar: 

 $^O     The name of the operating system under which this
         copy of Perl was built, as determined during the
         configuration process.  The value is identical to
         "$Config{'osname'}".  See also the Config manpage
         and the -V command-line switch documented in the
         perlrun manpage.

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--
Mike

In reply to Re: How can I check from wich OS the script is running? by RMGir
in thread How can I check from wich OS the script is running? by kidd

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