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  1. or download this
    #!/usr/bin/perl
use strict;
use warnings;
our $var = 1;
  2. or download this
    #!/usr/bin/perl
use strict;
...
print "\$var is $var\n";
do "file1.pl";
print "\$var now is $var\n";
  3. or download this
    poletti@flaviox ~/sviluppo/perl> perl file2.pl
$var is 10
$var now is 1