GIT

Checkout previously checked out branch

$ git checkout -

which is a shortcuts for

$ git checkout @{-1}

https://stackoverflow.com/a/7207542

Remove a remote tag

$ git tag -d 12345
$ git push origin :refs/tags/12345

Remove all local tags

(make sure to remove all remote tags before calling this command if you intend to remove both remote and local)

$ git tag | xargs git tag -d

To delete remote tags (before deleting local tags) simply do:

Remove all remote tags

$ git tag -l | xargs -n 1 git push --delete origin

faster:

$ git tag | xargs -L 1 | xargs git push origin --delete

Remove a remote branch

$ git push origin --delete <branchName>

$ git push origin :<branchName>

Remove a submodule

$ git submodule deinit [module]
Delete the relevant line from the .gitmodules file.
Delete the relevant section from .git/config.
$ rm -rf .git/modules/[module]
$ git rm --cached path_to_submodule (no trailing slash).
Commit the superproject.
Delete the now untracked submodule files.

Change timestamp on Git Commit

If you wanted to change the dates of commit 119f9ecf58069b265ab22f1f97d2b648faf932e0, you could do so with something like this:

git filter-branch --env-filter \
    'if [ $GIT_COMMIT = 119f9ecf58069b265ab22f1f97d2b648faf932e0 ]
     then
         export GIT_AUTHOR_DATE="Fri Jan 2 21:38:53 2009 -0800"
         export GIT_COMMITTER_DATE="Sat May 19 01:01:01 2007 -0700"
     fi'

Source: http://stackoverflow.com/a/454750/4273291

Add an earlier version of a file in a earlier commit

$ git rebase -i COMMIT
change 'pick' to 'edit' on the commit where you want to add the file
add the file, git commit --amend
$ git rebase --continue
you will get conflict (both added)
$ git checkout --theirs filename
$ git add filename
$ git rebase --continue

Diff

Latest

$ git diff HEAD^ HEAD

$ git diff HEAD^!

Current branch, diff between commits 2 and 3 times back

$ git diff HEAD~3 HEAD~2

Output a version of a file

$ git show COMMIT:./filename

Checkout remote branch

$ git checkout -b experimental origin/experimental

List commits for a specific file

$ git log --follow filename

Merging detached HEAD back into branch

Well, you arent actually mergin anything. You just need to point master to the detached HEAD commit.

$ git branch -f master HEAD && git checkout master

Source: http://stackoverflow.com/a/5772882

List all tracked files

$ git ls-tree -r master --name-only

Source: https://stackoverflow.com/a/15606995

Squash commits

Squash and write commit message from scratch:

$ git reset --soft HEAD~3 && git commit

If you want to start editing the new commit message with a concatenation of the existing commit messages (i.e. similar to what a pick/squash/squash/…/squash git rebase -i instruction list would start you with), then you need to extract those messages and pass them to git commit:

$ git reset --soft HEAD~3 && git commit --edit -m"$(git log --format=%B --reverse HEAD..HEAD@{1})"

Source: https://stackoverflow.com/a/5201642/4273291

Also possible to do via interactive rebase:

git rebase -i <after-this-commit>

Source: https://stackoverflow.com/a/5189600/4273291

Also..

# Reset the current branch to the commit just before the last 12:
git reset --hard HEAD~12

# HEAD@{1} is where the branch was just before the previous command.
# This command sets the state of the index to be as it would just
# after a merge from that commit:
git merge --squash HEAD@{1}

# Commit those squashed changes.  The commit message will be helpfully
# prepopulated with the commit messages of all the squashed commits:
git commit

Source: https://stackoverflow.com/a/5190324/4273291

Remove untracked files

Show what will be deleted:

$ git clean -n

To actually remove (if clean.requireForce is set, which it is by default)

$ git clean -f

Remove directories as well

$ git clean -fd

Cherry pick multiple

From A to B (including A)

$ git cherry-pick A^..B

Commit count

$ git rev-list --count HEAD

$ git rev-list --count COMMIT

Number of commits per author

$ git shortlog -s -n --all --no-merges

Push all local branches

$ git push --all origin

Push all branches from one remote to another

Source: https://stackoverflow.com/a/21133502/4273291

$ git push gitlab 'refs/remotes/origin/*:refs/heads/*'

Git

GIT