Git Command Reference
CS Fundamentals's Linux, Git & Tooling covers what a commit, a branch, and the object graph actually are underneath these commands. This page assumes add/commit/push/pull are already muscle memory and covers the commands that actually save you once something's gone wrong or history needs reshaping.
Interactive rebase
The tool for cleaning up commit history before it's shared — squashing, reordering, rewording, or dropping commits.
git rebase -i HEAD~5 # interactively rebase the last 5 commits
git rebase -i main # rebase the current branch onto main, interactively
In the editor that opens, each commit line takes a verb: pick (keep as-is), reword (keep, edit message), edit (pause here to amend), squash/fixup (merge into the previous commit), drop (remove).
git rebase --continue # after resolving a conflict or finishing an `edit` stop
git rebase --abort # bail out, return to the pre-rebase state
git rebase --skip # skip the current commit entirely
Bisect: finding which commit broke something
Binary search over history for the commit that introduced a bug.
git bisect start
git bisect bad # current commit is broken
git bisect good v1.2.0 # this earlier tag/commit was known good
# git checks out a midpoint commit -- test it, then:
git bisect good # or `git bisect bad`, repeat until it narrows to one commit
git bisect reset # done -- return to the original HEAD
Reflog: recovering "lost" commits
git log only shows reachable history. reflog shows everywhere HEAD has pointed, including commits a reset --hard or a bad rebase seemed to delete — they're still there until garbage collected.
git reflog # every HEAD movement in this repo, most recent first
git reset --hard HEAD@{2} # jump back to what HEAD pointed to 2 moves ago
git checkout <sha-from-reflog> # inspect a "lost" commit directly
git branch recovered-work <sha> # turn it back into a real branch
Worktree: multiple branches checked out at once
Avoids the stash-switch-stash dance when you need to work on two branches simultaneously without two full clones.
git worktree add ../hotfix hotfix-branch # new working directory, existing branch
git worktree add ../new-feature -b feature/x # new working directory AND new branch
git worktree list # show all active worktrees
git worktree remove ../hotfix # clean up when done
Cherry-pick and stash
git cherry-pick <sha> # apply one specific commit onto the current branch
git cherry-pick <sha1>..<sha2> # apply a range of commits
git cherry-pick --continue # after resolving a conflict mid-cherry-pick
git stash # shelve uncommitted changes, working dir goes clean
git stash -u # also stash untracked files
git stash list # see all stashes
git stash pop # reapply the most recent stash and drop it
git stash apply stash@{1} # reapply a specific stash, keep it in the list
git stash drop stash@{1} # delete a stash without applying it
Diagnosing and diffing
git log --oneline --graph --all # compact, visual branch history
git log -p -- path/to/file # full diff for every commit touching a file
git log -S"searchTerm" # commits that added/removed a string (the "pickaxe")
git blame path/to/file # who last touched each line, and in which commit
git diff HEAD~3 # working tree vs. 3 commits ago
git diff branch-a..branch-b # what changed between two branches