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If used numerically, yields the current value of the C errno variable,
+ or in other words, if a system or library call fails, it sets this v
+ariable. This means that the value of $!  is meaningful only immediat
+ely after a failure:

#!/usr/bin/perl  -Wl
sub doit {
...
$ type c:\boot.ini | perl -ne "print $1 if /\"(.*)\"/"
Windows NT 5.2(3790.srv03.SP1.rtm.050324-1447)