Can I undef ($v1, $v2, $vX); or does this only affect the first value in the array?

If it's an array, then you can just do @array = (); to undefine it. If they're really scalars, then you can shortcut it a little bit with $v1 = $v2 = $vX = undef;

Example:

#!/usr/bin/perl -w
use strict;

print "\nWith scalars..\n";
my ($var1, $var2, $var3) = (1, 2, 3);

foreach( $var1, $var2, $var3 ){
    print "$_, ";
}

print "\nundef them...\n";

$var1 = $var2 = $var3 = undef;
foreach( $var1, $var2, $var3 ){
    print "$_, "; # -w will complain about this.
}

print "\nWith an array..\n";
my @stuff = qw(a b c);
foreach( @stuff ){
  print "$_, ";
}

print "\nundef it...\n";

@stuff = ();
foreach( @stuff ){
  print "$_, "; # -w won't complain about this, because
                # @stuff is empty, so this line does not
                # execute
}
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