Answering 2019 thread in 2025, just to add another Textpad-specific option--record a 'keyboard macro'.

The macro recorder can be turned on via menu, Macros>>Record, or Ctrl+Shift+R. There is also a dark circle button, but may have to be made viewable--don't recall if it's on by default.

Begin recording at the 1st line in file, then hit the {END} key, then {ENTER}, then {RIGHT ARROW}, and end recording. You can save the macro, but if not it will be a "scratch" macro, and immediately accessible via Ctrl+R, which can be held to the end of the file. Or, from the menu, Macros>>Multiplay (Ctrl+F7), and "Repeat to end of file"<--this assumes the last row is terminated, or else it may continue looping (Esc to end). The other multi-play selections can be used too: "Specified number of times", or "Repeat through selection" (requires selecting the text).

Good luck!