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  1. or download this
    package Defined;

...
}

1;
  2. or download this
    #!/usr/bin/perl

...
$var = 1;
print $var;
$var = 5
  3. or download this
    bash-3.00$ ./test.pl
main ./test.pl 11 -> $var undefined
main ./test.pl 12 -> $var defined with value 1
main ./test.pl 13 -> $var defined
main ./test.pl 14 -> $var defined with value 5