stg-undo - Undo the last operation
       stg undo
       Reset the patch stack to the previous state. Consecutive invocations of
       "stg undo" will take you ever further into the past.
       -n N, --number N
           Undo the last N commands.
       --hard
           Discard changes in your index/worktree.
       Part of the StGit suite - see linkman:stg[1]