How to revert done item?

[ys7i]

When I mistakenly change the item status to done, is there any way to recover?

For example,

$ todo.sh add test
=> 4 test
TODO: 4 added.

$ todo.sh done 4
$ todo.sh listall
=> 0 x 2025-10-11 test

Except for creating the same task again, is there any way to recover test item?
After changing item to done, the item will lose own number. So there's no such feature for now?

[inkarkat]

You seem to have auto-archiving enabled, so a done task is automatically moved from todo.txt to done.txt. Therefore, the first step is to move the task back:

$ todo.sh mv 2 todo.txt done.txt

(There's no numbering of the archived tasks; you need to obtain the task number by manually counting (eh) or (better) from the DONE: 2 of 2 tasks shown line of the listall output.)
If you disable auto-archiving (export TODOTXT_AUTO_ARCHIVE=0 in todo.cfg), done tasks aren't automatically moved and instead you need to occasionally clean up the task list via todo.sh archive. I like this configuration because you'll have all recently done tasks still close by, and the explicit archiving (e.g. every weekend) allows you to review what has been achieved during that week.

This turns the undo into a single command that just removes the done marker and done date:

$ todo.sh del 4 'x 2025-10-11 '

A custom action (like my undo) can simplify this even further: $ todo.sh undo 4