Delete directory from history

git filter-repo --invert-paths --path filename

Can use --refs master..HEAD to only change stuff between master and current HEAD

Merge branch but discard its history (add a single commit)

  1. checkout target branch (e.g., master)
  2. git merge --squash SOURCE_BRANCH

Alternative

  1. check out source branch (e.g., ci)
  2. soft reset to target branch (e.g., master)
  3. commit
  4. delete master & rename ci to master
  5. done!

Set all commit dates to author dates

git filter-branch --env-filter 'export GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"'

(https://stackoverflow.com/questions/28536980/git-change-commit-date-to-author-date)

Sort uncommited files by modification time

Staged:

git diff --name-only --cached | xargs stat -c '%y %n' -- | sort

Modified, unstaged:

git ls-files -m | xargs stat -c '%y %n' -- | sort

Untracked (respecting .gitignore)

git ls-files -o --exclude-standard | xargs stat -c '%y %n' -- | sort

Spin subdirectory off into new repo

This works well: https://stackoverflow.com/a/17864475

(git subtree is safe, it creates a new branch)