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  1. or download this
    use strict;
use IO::File;
...
}
undef $f;
undef $o;
  2. or download this
    ---- first.txt ----
0001:rec1:rec2:rec3
...
---- second.txt ----
0001:rec4:rec5:rec6
0002:recD:recE:recF
  3. or download this
    ---- third.txt ----
0001:rec1:rec2:rec3:rec4:rec5:rec6
0002:recA:recB:recC:recD:recE:recF