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  1. or download this
    #!/usr/bin/perl
use strict;
...
This is the first line in the file.
This is the third line in the file.
This is the forth line in the file.
  2. or download this
    #!/usr/bin/perl
use strict;
...
          'This is the changed line in the file.',
          'This is the forth line in the file.'
        ];
  3. or download this
    #!/usr/bin/perl
use strict;
...

$ perl test.pl
StdOut: 'file.txt' -> 'fileTest.txt'