This is a cheatsheet for useful Git commands that we use semi-regularly, mostly for internal use as a quick future reference but I figured I would share.
Change commit author date
git commit --amend --no-edit --date="Wed Mar 30 22:45:55 2022 +0200"
Get last commit to modify file
git log -n 1 --format="%H %s" -- path/to/file
Get first commit
git log --reverse --format="%H %s" | head -1
Find commits with modified code matching some string
git log --branches -S'some code you need to fix'
Find commits with modified code matching some regular expression
git log --branches -G'some code you need to fix'
Create a commit message with a trailer
git commit -am 'add something' --trailer="Molecule: apiPackageManager=NPM, apiLanguage=TypeScript"
Find dangling commits
git fsck --lost-found 2>&1 | grep "dangling commit"
Wipe unused history
git for-each-ref --format="delete %(refname)" refs/original | git update-ref --stdin
git reflog expire --expire=now --expire-unreachable=now --all
git gc --prune=now --aggressive
Remove untracked files and directories
git clean -f -d
Delete all remote branches:
git branch -r | grep origin/ | grep -v 'index$' | grep -v HEAD| cut -d/ -f2 | while read line; do git push origin :$line; done;