get rid of sh/dx debugging warnings

diff --git a/cmd/show/dx.pl b/cmd/show/dx.pl
index 655630ce798b24baee204c2899230095b2db3b90..6a9a3829a3a7a79f5878034703edd9a7bfb2959d 100644 (file)
--- a/cmd/show/dx.pl
+++ b/cmd/show/dx.pl
@@ -44,13 +44,13 @@ sub handle
        
        while ($f = shift @list) {      # next field
                dbg "sh/dx arg: $f list: " . join(',', @list) if isdbg('sh/dx');
-               if (!$from && !$to) {
-                       ($from, $to) = $f =~ m|^(\d+)[-/](\d+)$|; # is it a from -> to count?
+               if ($f && !$from && !$to) {
+                       ($from, $to) = $f =~ m|^(\d+)[-/](\d+)$| || (0,0); # is it a from -> to count?
                        dbg("sh/dx from: $from to: $to") if isdbg('sh/dx');
                        next if $from && $to > $from;
                }
-               if (!$to) {
-                       ($to) = $f =~ /^(\d+)$/o if !$to; # is it a to count?
+               if ($f && !$to) {
+                       ($to) = $f =~ /^(\d+)$/o || 0 if !$to; # is it a to count?
                        dbg("sh/dx to: $to") if isdbg('sh/dx');
                        next if $to;
                }