Rob@desktop2 ~/pscrpt
$ cat try.pl
#!C:/perl58_M/bin/perl
print $^X, "\n";
print $^O;
Rob@desktop2 ~/pscrpt
$ perl try.pl
/usr/bin/perl.exe
cygwin
Rob@desktop2 ~/pscrpt
$ ./try.pl
C:\perl58_M\bin\perl.exe
MSWin32
Rob@desktop2 ~/pscrpt