>perl -v
This is perl, v5.8.3 built for i386-linux-thread-multi

Copyright 1987-2003, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
+t.

Complete documentation for Perl, including FAQ lists, should be found 
+on
this system using `man perl' or `perldoc perl'.  If you have access to
+ the
Internet, point your browser at http://www.perl.com/, the Perl Home Pa
+ge.

>cat rv
#!/usr/bin/perl -w
    use strict;
    my $rv = 42 for (1);
    print "$rv\n";
>./rv
Use of uninitialized value in concatenation (.) or string at ./rv line
+ 4.

>perl -Mstrict  -wle'my $rv=42 for (1); print ">$rv<"'
Use of uninitialized value in concatenation (.) or string at -e line 1
+.
><
>
[download]

Cheers,
R.