I have the following line, which removes any whitespace at the start and end of some variables

s/^\s+|\s+$//g for ( $ipaddress, $prefix, $interface, $device, $locati
+on, $comment );

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But, i get a common error: "Use of uninitialized value $_ in substitution (s///)" as sometimes some of these variables are undefined.

I've seen a few ways to resolve the error, but not sure of the way I can do it with the least amount of code. I guess I can do:

if(defined $ipaddress) {
    //
}
if(defined $prefix) {
    //
}
etc.

[download]

But there must be a shorter way?

In reply to Test if multiple variables are defined by stroke

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