'perldoc perlvar' 
$OSNAME
$^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 Config and t
+he
        -V command-line switch documented in perlrun.

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In reply to Re^2: how to recognize windows and linux os by Anonymous Monk
in thread how to recognize windows and linux os by Manjunath

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