git 回滚单个文件

1  只修改一个文件，查看当前状态

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#
no changes added to commit (use "git add" and/or "git commit -a")

2 使用checkout ，回滚文件

$ git checkout -- src/main/filter/dev-filter.properties

查看结果

$ git status
# On branch master
nothing to commit, working directory clean

使用两个减号 -- 什么意思呢，不用行不行，试试~~

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#
no changes added to commit (use "git add" and/or "git commit -a")

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git checkout  src/main/filter/dev-filter.properties

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
nothing to commit, working directory clean

发现git checkout file 把文件从当前的修改状态会退到上次修改状态，有没有两个减号 --效果一样，可能其他作用有待发现

3 文件修改提交到index后，又修改了工作区文件内容

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#

只从index撤销但不撤销工作区修改，这样工作区可接着上次修改继续，

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git  reset src/main/filter/dev-filter.properties
Unstaged changes after reset:
M       jingwei-webconsole/src/main/filter/dev-filter.properties

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#
no changes added to commit (use "git add" and/or "git commit -a")

第二种情况是不但从index撤销，而且还把work区的修改也撤销 git checkout HEAD，从history既搞index又搞work~~

（1）修改work（2）add 到index（3）修改work   

要把index和work都撤销到上次提交

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git checkout HEAD src/main/filter/dev-filter.properties

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
nothing to commit, working directory clean

第三种情况，把work回退到index中的状态

（1）修改work （2）add到index （3）再修改work  想要回退到index中状态，也就是（2）执行后的状态

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git checkout src/main/filter/dev-filter.properties

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#

第四种情况，想要继续add呢

（1）修改work （2）add到index （3）再修改work，这时候想继续add，就继续add，相当于把最新的更新合并到index中去

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#
# Changes not staged for commit:
#   (use "git add ..." to update what will be committed)
#   (use "git checkout -- ..." to discard changes in working directory)
#
#       modified:   src/main/filter/dev-filter.properties
#

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git add .

shuohailhl@SHUOHAILHL-PC /f/ggg/jingwei/jingwei-webconsole (master)
$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD ..." to unstage)
#
#       modified:   src/main/filter/dev-filter.properties
#