Somehow, the aliasing of the input to $_ is getting mixd up with the first element of @_
When you do screwed($_) variable $_ gets aliased to $_[0] inside screwed() as subroutine parameters always aliased to elements of @_ array inside the subroutine. So later when while loop modifies $_ it affects $_[0] too.
Shorter demo:
$_ = 1;
test($_);
sub test {
$_ = 2;
print $_[0], "\n";
}
# output of script
__END__
2
Yet another example why I think while(<>) { ... } considered harmful.
--
Ilya Martynov, ilya@iponweb.net
CTO IPonWEB (UK) Ltd
Quality Perl Programming and Unix Support
UK managed @ offshore prices - http://www.iponweb.net
Personal website - http://martynov.org
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