See $^O in perlvar:
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 Config and the -V command-line switch documented in perlrun. In Windows platforms, $^O is not very helpful: since it is always MSWin32 , it doesn't tell the difference between 95/98/ME/NT/2000/XP/CE/.NET. Use Win32::GetOSName() or Win32::GetOSVersion() (see Win32 and perlport) to distinguish between the variants
Unless I state otherwise, all my code runs with strict and warnings

In reply to Re: recognizing OS by FunkyMonk
in thread recognizing OS by PerlZealot

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