The name of the operating system under which this copy of Perl was built, as determined during the configuration process. For examples see"PLATFORMS" in perlport.
The value is identical to$Config{'osname'}. See alsoConfig and the-V command-line switch documented inperlrun.
In Windows platforms,$^O is not very helpful: since it is alwaysMSWin32, it doesn't tell the difference between 95/98/ME/NT/2000/XP/CE/.NET. UseWin32::GetOSName() or Win32::GetOSVersion() (seeWin32 andperlport) to distinguish between the variants.
This variable was added in Perl 5.003.
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