git常见操作

References:

http://stackoverflow.com/questions/315911/git-for-beginners-the-definitive-practical-guide

http://www.kernel.org/pub/software/scm/git/docs/

http://progit.org/book/

git安装、配置用户名邮箱、SSH服务器搭建

http://www.cnblogs.com/elfsundae/archive/2011/07/06/2099182.html

Create/List/Remove a new Project/Repository

$ git init 
将在当前目录创建一个隐藏的名为".git"的目录。
$ git init project1
等价于 $ mkdir project1 && cd project1 && git init
$ git status 
检查当前目录是否包含一个git repo
$ ls .git 
查看git目录
$ rm -rf .git/ 
移除有关git的所有东西

Configure git to ignore files

.gitignore文件可以定义要忽略的文件。详细规则见http://www.kernel.org/pub/software/scm/git/docs/gitignore.html

过滤文件夹: /build/
过滤某种类型的文件:  *.tmp
过滤某各文件: /Build/Products/test.app
!开头表示不过滤： !*.c , !/dir/subdir/
支持通配符： *.[oa] 过滤repo中所有以.o或者.a为扩展名的文件

有三种方法应用过滤：

1. 对该repo的所有用户应用过滤:
   将 .gitignore 文件放在工作目录的跟目录，编辑.gitignore完成后提交
   git add .gitignore
2. 仅对自己的repo备份过滤:
   添加/编辑你工作目录的$GIT_DIR/info/exclude,例如你的working copy目录是
   ~/src/project1 , 则路径为
   ~/src/project1/.git/info/exclude
3. 系统全局过滤
   创建一个ignore文件，名字随意起，比如我的放在 ~/.gitglobalignore ，然后配置git：
   $ core.excludesfile = ~/.gitglobalignore

.gitignore文件示例:

.DS_Store
### build directory
iMochaApp/build/
iMochaSDK/build/
### Testing projects directory
/Testing/

Getting the latest Code

$ git pull <remote> <branch> # fetches the code and merges it into 
                             # your working directory
$ git fetch <remote> <branch> # fetches the code but does not merge
                              # it into your working directory

$ git pull --tag <remote> <branch> # same as above but fetch tags as well
$ git fetch --tag <remote> <branch> # you get the idea

Checking Out Code (clone)

$ git clone user@host.com/dir/to/repo [Target DirName]

Commit Changes

当修改了文件，你需要提交(commit)这些更改。

$ git commit source/main.c
上句将提交 ./source/ 目录下的 main.c 文件。

$ git commit -a
-a标识表示提交所有修改过的文件，但是不提交新增加的文件。新增加的文件需要使用$ git-add 将其添加到git的索引中。

“提交”仅改变你本地repo，如果要提交更改到服务器，需要使用push：
$ git push <remote> <branch>

查看当前状态

$ git status 可以查看当前工作与那个branch，将要提交什么，提醒你忘记了什么等等...

Undo/Revert/Reset a commit

如果不想让当前的更改生效，返回之前的提交，可以运行如下命令:
# Revert to a previous commit by hash:
$ git-reset --hard <hash>

可使用 HEAD^ 快捷指定上一次提交hash：
# Revert to previous commit:
$ git-reset --hard HEAD^

文件比较

比较命令是 $ git diff

# to compare 2 revisions of a file:
$ git diff <commit1> <commit2> <file_name>

# to compare current staged file against the repository:
$ git diff --staged <file_name>

#to compare current unstaged file against the repository:
$ git diff <file_name>

How do you see the history of revisions to a file?

$ git log -- filename

git branch (分支)

git默认分支叫 master

# create a new branch
$ git branch <branch-name>
# to see a list of all branches in the cureent repoitory 
$ git branch
# if you want to switch to another branch you can use
$ git checkout <branch-name>
# to create a new branch and switch to it in one step
$ git checkout -b <branch-name>
# to delete a branch:
$ git branch -d <branch-name>
# to create a branch with the changes from the current branch,do :
$ git stash
$ git stash branch <branch-name>

How do you merge branches?

if you want to merge a branch(e.g. "master" to "release"), make sure your current branch is the target branch you'd like to merge into(use $git branch or $git status to see your current branch).

Then use
$ git merge master
(where master is the name of the branch you want to merge with the current branch).

If there are any conflicts, you can use
$ git diff
to see pending conflicts you have to resolve.

跟踪远程分支

假设你已经clone了一个具有 'some_branch' 分支的远端repo.下面的命令将本地跟踪这个分支：

# list remote branches
git branch -r

# start tracking one remote branch
git branch --track some_branch origin/some_branch

# change to the branch locally
git checkout some_branch

# make changes and commit them locally
....

# push your changes to the remote repository:
git push

创建远程分支

# create a new branch locally
git branch name_of_branch
git checkout name_of_branch
# edit/add/remove files    
# ... 
# Commit your changes locally
git add fileName
git commit -m Message
# push changes and new branch to remote repository:
git push origin name_of_branch:name_of_branch

删除远程分支

git push [远程名] :[分支名]

$ git push origin :mybranchname