Git configuration (initial configuration)
# your name and email address $ git config --global user.name "Akul Mehra" $ git config --global user.email YOUR-EMAIL-ADDRESS # more optional git config stuff $ git config --global core.editor vim $ git config --global merge.tool vimdiff
Global settings are put in this file:
There is also a Git configuration file in your current Git repository. See this file in your repository:
Git also uses this file:
You can check your Git configuration using commands like these:
# show all git configurations $ git config --list # show a specific key $ git config user.name
Initializing a Git repository (existing directory/project)
If you have an existing directory or project and want to create a Git repository from it, do something like this:
$ git init $ git add * OR $ git add .
$ git commit -m 'initial commit'
Note that your Git project directory will now have a .git subdirectory. (Explore that directory for more information.)
Git - Ignoring files with .gitignore
Before adding everything to your repository, it may be helpful to know .gitignore:
$ cat .gitignore # ignore java class files *.class # ignore binary/compiled files *.[oa] # ignore temporary files *~
Some .gitignore pattern/naming rules:
- Blank lines are ignored
- Lines beginning with ‘#’ are ignored
- Standard glob patterns work (.a, .o)
- Can specify root directory files like ‘/TODO’
- End patterns with a slash to specify a directory (bin/)
- Negate a pattern by beginning it with an ‘!’
Another Git init example (Github)
Here’s a Git init example from Github, showing how to create and push a Git repository to Github:
$ mkdir example $ cd example $ git init $ touch README $ git add README $ git commit -m 'first init' $ git remote add origin firstname.lastname@example.org:alvinj/example.git $ git push origin master
How to push an existing Git repository to Github:
$ cd example $ git remote add origin email@example.com:alvinj/example.git $ git push origin master
Git checkout - Cloning a Git repository
There isn’t really a “git checkout” command. Instead, you “clone” a Git repository:
# clone a git repo from github $ git clone firstname.lastname@example.org:username/reponame.git # one of my projects $ git clone email@example.com:alvinj/Cato.git
Note: If you clone a repository, this command automatically adds that remote repository under the name “origin”.
Renaming a repository/directory while cloning:
$ git clone firstname.lastname@example.org:alvinj/Cato.git cato
Git clone command using SSH:
$ git clone ssh://username@hostname:ssh-port/path/to/foobar.git
the SSH port isn’t required, just leave it off:
$ git clone ssh://username@hostname:/path/to/foobar.git
If you don’t specify a protocol, Git assumes SSH:
$ git clone username@hostname:projectname.git
Adding files to a Git repository
Ways to add a file to an existing Git repository:
# create new file $ touch README # add file to staging area $ git add README # commit the file $ git commit -m 'yada yada'
A faster/easier way is to skip the Git staging area:
$ touch README $ git commit -a -m 'yada yada'
Git status and diff commands
$ git status $ git diff $ git diff --cached
Git - Removing files
How to remove files from Git.
# TODO is this step necessary? $ rm README $ git rm README $ git commit -m 'yada yada'
There is also a Git remove cached option:
$ git rm --cached README
See Pro Git Chapter 2 for more “Git remove” information.
Git - Moving files
Git is smart about files that have been moved/renamed without using “git mv”, but you can do this for clarity/obviousness:
$ git mv README readme.txt
TODO - more here
Git push (sharing changes)
To share your commits with others, you need to push your changes back to the remote repository. The basic command is:
$ git push [remote-name] [branch-name]
As you saw earlier, a git push command to push your master branch to an origin server looks like this:
$ git push origin master
Note from Pro Git:
This command works only if you cloned from a server to which you have write access and if nobody has pushed in the meantime. If you and someone else clone at the same time and they push upstream and then you push upstream, your push will rightly be rejected. You’ll have to pull down their work first and incorporate it into yours before you’ll be allowed to push.
Git remote commands
From Pro Git:
Remote repositories are versions of your project that are hosted on the Internet or network somewhere. You can have several of them, each of which generally is either read-only or read/write for you.
To see which remote servers you have configured, run this command from within a Git directory:
$ git remote origin another-server yet-another-server
Or for more detailed git remote information:
$ git remote -v [remote-name] [remote-url]
You can use a command like this to inspect a Git remote:
$ git remote show origin
where origin is more generally the name of your remote:
$ git remote show [remote-name]
“git update” - Getting data from remote repositories (git fetch, git pull)
To pull the latest changes from a git repository into your local already-existing repository, use the “git pull” or “git fetch” commands. I think you use git pull to get the latest changes from the repository and have them automagically merged (or possibly to overwrite) your local files (TODO - research this):
$ git pull
$ git pull [remote-name]
To pull down all the data from a remote project that you don’t have, so you can then do a manual merge, I believe git fetch is the correct command:
$ git fetch
$ git fetch [remote-name]
Note from Pro Git:
It’s important to note that the fetch command pulls the data to your local repository — it doesn’t automatically merge it with any of your work or modify what you’re currently working on. You have to merge it manually into your work when you’re ready.
I think the “git fetch” workflow here looks something like this, but I still have a lot to learn here:
$ git fetch origin $ git log -p master origin/master # manually check and adjust the differences $ git merge origin/master
Please see the online Git book for more information here, I have only done basic “git fetch” exercises at this point, and typically use “git pull” (which is like a “cvs update” or “svn update”, because I’m the only one working on my current projects).
You can also rename remote Git repositories. See the Pro Git book.
Git status (like ‘cvs status’ or ‘svn status’)
If you need to see the status of your local Git repository compared to the repository on a remote server named origin, you can use this command:
$ git remote show origin
If everything is up to date, this will show output like this:
Fetch URL: ssh://user@host:port/path/to/git/myapp.git Push URL: ssh://user@host:port/path/to/git/myapp.git HEAD branch: master Remote branch: master tracked Local branch configured for 'git pull': master merges with remote master Local ref configured for 'git push': master pushes to master (up to date)
This seems similar to the “cvs status” and “svn status” commands, where you’re comparing your local sandbox/repository to the server’s repository.
See the Pro Git tagging chapter for information on Git tagging.
See the Pro Git Branching chapter for Git branching information.
Here’s what the Git help output looks like on my current Mac system:
Config file location --global use global config file --system use system config file -f, --file <FILE> use given config file Action --get get value: name [value-regex] --get-all get all values: key [value-regex] --get-regexp get values for regexp: name-regex [value-regex] --replace-all replace all matching variables: name value [value_regex] --add adds a new variable: name value --unset removes a variable: name [value-regex] --unset-all removes all matches: name [value-regex] --rename-section rename section: old-name new-name --remove-section remove a section: name -l, --list list all -e, --edit opens an editor --get-color <slot> find the color configured: [default] --get-colorbool <slot> find the color setting: [stdout-is-tty] Type --bool value is "true" or "false" --int value is decimal number --bool-or-int value is --bool or --int --path value is a path (file or directory name) Other -z, --null terminate values with NUL byte
Just type “git config” or something similar to see this Git usage statement.
You can also type commands like these:
$ git help $ git help [command] $ git [command] --help $ man git-[command]
Basic Git log commands:
$ git log
How to do a SVN-like “export” with Git:
git archive master | bzip2 > project-source.tar.bz2
For more “Git export” information, type “git help archive” at your command line.
(I found this answer on stackoverflow, thanks.)
Other Git reference pages
Other Git reference pages:
http://gitref.org/ http://progit.org/book/ How I set up a private Git SSH repository on A2 Hosting How to install Git on Mac OS X
Git TODO list
Git commands I need to add to this Git cheat sheet:
- git remote
- git branching and merging
- More git logging
- git tag
- More git push
- More git diff
Git cheat sheet - Summary
I hope this Git cheat sheet (Git reference page) has been helpful. The Source for this cheat sheet is available here.