Pluralsight: Git Fundamentals

History

1st Generation - single file
2nd Generation - multiple file - centralized e.g. SVN, TFS
3rd Generation - works on change sets - distributed e.g. Git, Hg, Bazaar, BitKeeper

git config --list to see all configs
git config --global --list to see global configurations
git config --list --show-origin list configs with location of file where specified
git config --global user.name "Claire Furney" to configure the user name
git config --global core.editor vim
git config --global help.autocorrect 1 to configure fuzzy matching on git commands
git config --global color.ui auto
git config --global core.autocrlf input can be one of true|false|input (generally set to true on Win and input on Mac OSX)
git config --global alias.lga "log --graph --oneline --all --decorate"

More specific override more general, so you can override certain settings just for a particular repo.

git init - initialise a new repo
git add README.txt - add a new file to be staged for commit
git add -u - stage any updated files (will notice updates or deletes, any files it already knows about)
git add -A - add all files including any untracked ones (careful not to add anything you don’t want tracked)
git log - to show commit history
git diff dd6819a..a15ec6b - to diff two commits
git diff HEAD~1..HEAD to diff the penultimate commit (HEAD~1) and the latest commit (HEAD)

By staging and commiting in two parts, you can stage and commit different unrelated changes separately.

Use rm or mv as normal to delete or rename files, stage any changes and commit them, Git will recognise renames as such.

git checkout README.txt will by default checkout the HEAD version of a file and overwrite any local changes
git reset --head will checkout all changes from HEAD, overwriting any local changes
git reset --soft HEAD~1 will checkout the HEAD~1 commit with the latest changes previously committed staged
git reset --hard HEAD will checkout the HEAD~1 commit and lose all previously committed changes
git clean cleans up a working copy and removes any unstaged files
git clean -n shows what if information
git clean -f forces the clean

git log --oneline shows commit messages on one line
git log --oneline | wc -l pipes this into wc to count the number of commit messages (-l = number of lines)
git log --oneline --graph to show a simple graph of branches
git log --oneline --all --decorate to show any tags, labels
git log origin/master to show the logs
git shortlog shows commits by author
git shortlog -sne shows summary (no commit msgs), numerically by number of commits, emails included
git show HEAD to show details of the last commit, use HEAD~1 or HEAD~10 or just the sha hash to show other commits
git remote to show your remotes
git remote -v to show the details of the remotes
git reflog to show the log of where HEAD has been pointing

http(s) on ports 80 and 443 e.g. https://github.com/jquery/jquery.git - read/write; password for auth
git protocol on port 9418 e.g. git://github.com/jquery/jquery.git - read only; anonymous only
ssh on port 22 e.g. git@github.com:jquery/jquery.git - read/write; ssh keys for auth file e.g. /Users/claire/repos/jquery - read/write; local only

Branches are simply labels on the sha1 commits, but following along with more recent commits.

git branch shows the local branches
git branch -r shows the remote branches
git branch -v
git remote add [remote-alias] [remote-url] if you use the ssh version it will be able to push without creds if ssh keys have been set up
git fetch
git merge origin/master merge from origin/master in to current local branch - get a message fast-forward, then no merging / commiting needed to be done and git was able to just move the HEAD pointer to the latest commit
git pull will only work if you have already specified an upstream remote tracking branch
git pull origin master if you haven’t specified the upstream branch - same as git fetch && git merge origin/master
git remote rm origin to remove a configured remote
git branch feature1 to create a new feature1 branch
git checkout feature1 to switch to it
git checkout -b feature2 to create a new branch and switch to it
git branch fix1 a15ec6b to create a branch of a particular commit, and then git checkout fix1
git branch -m fix1 bug1234 to rename a branch

Useful way as a temporary holding area for changes you don’t want to commit to a branch, but you don’t want to lose.

git stash to rollback any uncommitted changes on the current branch and stash those changes
git stash list to list current stashes
git stash apply to reapply the uncommitted changes from the stash, stash stays in stash list
git stash pop to reapply the uncommitted changes from the stash, stash is removed from stash list
git stash drop to drop things from the stash list
git stash branch feature3 to create a branch from a stash, stash is popped

git merge feature1 will merge the feature1 branch in the the current local branch
git mergetool to resolve any merge conflicts
git diff --cached compare the repo to the staging area

git rebase master rebase your changes on top of master - useful after pulling in any recent repo changes to master. If there are any conflicts with this, then run git mergetool to resolve these
git rebase --continue to retry the rebase