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use strict;
use warnings;
...
my @one_to_six = 1..6;
print "Counting up: " . @one_to_six . "\n";  # scalar context (no. of 
+elts)
print "Counting up: " , @one_to_six , "\n";  # list context

Use of uninitialized value $. in range (or flip) at cnt.pl line 4.
Counting up:
...
Counting up: 1 2 3 4 5 6
Counting up: 6
Counting up: 123456