The idea of not changing global variables is a good thought, but, changing $ENV within a perl script does not effect the shell that the script was run from, you can see that by doing: 
$ echo $TERM; perl -e '$ENV{$TERM} = "strange";'; echo $TERM

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This holds true whether you edit the (any) variable from Perl or from another (sub-)shell.

In reply to Re^2: Problem running IPTraf from Perl by RobPayne
in thread Problem running IPTraf from Perl by Anonymous Monk

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