<wib_jonas> `` hg log --removed -r 12473: -T "u\\n" -l 1 /hackenv/wisdom/password | grep -q || slashlearn \'password//The password of the month is up against his power, they were just like bugs.\'

`revert <rev>" can be used to revert to a revision. See <https://hack.esolangs.org/repo/>. It is a builtin command so cannot be called from other commands.