#specify interface on commandline or here
my $iface = $1 || 'eth0';

[download]

$1 is only valid after a successful regular expression match with capturing parentheses.

That should be: 

#specify interface on commandline or here
my $iface = shift || 'eth0';

[download]

In reply to Re: Tk Bandwidth use indicator by jwkrahn
in thread Tk Bandwidth use indicator by zentara

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