git commit --fixup and git rebase --autosquash

git-fixup-autosquash.sh

# git commit --fixup + git rebase --autosquash
# Fix any past commit cleanly — no painful interactive rebase editing.

# Spot a typo in the third commit back:
git add the-fix.rs
git commit --fixup HEAD~2
# creates: "fixup! <original commit message>"

# Let autosquash reorder + squash automatically:
git rebase -i --autosquash main
# The fixup is already placed below its target in the todo list.
# Just save and close — no editing needed.

# ── Make this the default globally ────────────────────────────
git config --global rebase.autoSquash true
# Now plain `git rebase -i` always applies autosquash behaviour.

# ── fixup! vs squash! ─────────────────────────────────────────
# --fixup   → silently squashes, keeps original message
# --squash  → squashes and opens editor to combine messages