Githandson

Git Hands-on

All of these exercises should be followed on naf-school03 using your school account

Note that lines beginning with a $ sign implies a shell command!

Exercise 1 (Configuration)

• $ mkdir -p ~/school/git
• $ cd ~/school/git
• Configure git
  • $ git config --global user.name "Your Name"
  • $ git config --global user.email you.email@domain

• $ cat ~/.gitconfig

• optional extras for config (and obviously editor is mutually exclusive)
  • $ git config --global color.ui auto # If you like colours!
  • $ git config --global alias.co checkout
  • $ git config --global alias.st status
  • $ git config --global alias.ci commit
  • $ git config --global core.editor emacs # flame bait
  • $ git config --global core.editor vim

Exercise 1 (Basics)

Let's commit some stuff to git...

• $ git init
• $ git status
• $ touch readme.txt
• $ git commit
• $ git add .
• $
• $ git clone git@naf-school04:gitlab
• $ cd gitlab
• $ git status
• $ vi ${USER}.txt
  • write something
• $ git status # what is updated? Working tree, Index or Repository?
  • $ git diff
  • $ git diff HEAD
  • $ git diff --cached
• $ git add ${USER}.txt
  • $ git status
  • $ git diff
  • $ git diff HEAD
  • $ git diff --cached
• $ git commit -m "Add user text file"
  • $ git status
  • $ git diff
  • $ git diff HEAD
  • $ git diff --cached
• $ git push origin master
  • this might not work! Why?
  • tip: what does “git pull --rebase” do?
• $ git checkout -b ${USER} master # specifying "master" here is just a good habit. Always beware of defaults.
• $ vi config.yaml
  • Add a user to the list
• $ git add -p
• $ git commit -m "Adding ${USER} to users list"
• $ git push origin ${USER}
• $ git checkout master
• $ git merge ${USER}
• $ git push origin master
  • What happens?
• $ git checkout -b newfeature_${USER} master
• $ vi config.yaml
  • add a server
  • commit the change (with a good message!)
  • $ git log
• Oops! We mistyped the server, vi config.yaml again
  • change the name of the server
  • commit the change
  • $ git rebase -i HEAD~2
  • use “fixup” or “squash” on the fix (make sure you understand the difference)
  • $ git log # examine the differences

Git cheat sheet

Git configuration

• Git levels:

/etc/gitconfig - global git config for any user

~/.gitconfig -user specific

~/repo/.git/config -repo specific

each level ovewrites prevous.

git config --global user.name "Your Name"

git config --global user.email you.email@domain

git config --global color.ui auto # If you like colours!

git config --global alias.co checkout

git config --global alias.st status

git config --global alias.ci commit

git config --global core.editor emacs

Git basics

git init                        - create new local repo 

git clone /path/to/repository   - check out a repository

git clone https://github.com/   - clone repo from github 

git add <filename>              - add specified file 

git add .                       - add all subdirectories and files recursivly