What about a simple grep like this?

s/^\s+|\s+$//g grep {defined $_} for ( $ipaddress, $prefix, $interface, $device, $locati;

That wouldn't work, s/// either works on the string binded to it with =~ (or !~) or on $_ otherwise, not on a list parameter. Look at AnomalousMonk's answer for the correct syntax.

In reply to Re^2: Test if multiple variables are defined by Eily
in thread Test if multiple variables are defined by stroke

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