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  1. or download this
    $ head -n 1 *.pm
==> AA.pm <==
package AA; use base qw/Exporter/; our @EXPORT=qw/$knob1/; our $knob1 
+= 'no'; 1
...
42
42
42
  2. or download this
    $ head -n 1 *.pm
==> AA.pm <==
package AA; use base qw/Exporter/; our @EXPORT=qw/$knob1/; our $knob1 
+= 'no'; 1
...
42
Use of uninitialized value in print at -e line 1.