如何获取当前的git分支的名称放入一个shell脚本变量？ [英] How to get the name of the current git branch into a variable in a shell script?

问题描述

我是新来的shell脚本并不能想出解决办法。如果你不熟悉，命令的Git分支返回类似

I am new to shell scripting and can't figure this out. If you are unfamiliar, the command git branch returns something like

* develop
  master

，其中星号标记当前已签出的分支。当我运行在终端如下：

, where the asterisk marks the currently checked out branch. When I run the following in the terminal:

git branch | grep "*"

我得到：

* develop

如预期。

然而，当我运行

test=$(git branch | grep "*")

或

test=`git branch | grep "*"`

然后

echo $test

，结果仅仅是一个目录中的文件的列表。我们如何做测试的值=*发展？

, the result is just a list of files in the directory. How do we make the value of test="* develop"?

那么下一步（一旦我们得到*发展到一个变量名为test），是让子。请问这只是下面？

Then the next step (once we get "* develop" into a variable called test), is to get the substring. Would that just be the following?

currentBranch=${test:2} 

我与子功能的玩弄和我坏替代的错误很多，不知道为什么。

I was playing around with that substring function and I got "bad substitution" errors a lot and don't know why.

推荐答案

*为扩展，你可以做的是利用战略经济对话，而不是grep和立即得到分支的名称：

The * is expanded, what you can do is use sed instead of grep and get the name of the branch immediately:

branch=$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')

和一个版本用git象征-REF，由Noufal易卜拉欣建议

And a version using git symbolic-ref, as suggested by Noufal Ibrahim

branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

要阐述的扩大，（马可已经没有，）扩张发生在回音，当你做回声$测试包含$测试*大师然后*是根据正常扩张规则扩大。共进晚餐preSS这个一会要引用变量，如由Marco：回声$测试。另外，如果你摆脱了星号的你回声之前，一切都会好起来的，例如回声$ {测试：2} 只是回声大师。另外，您可以为您已经提出重新分配给它：

To elaborate on the expansion, (as marco already did,) the expansion happens in the echo, when you do echo $test with $test containing "* master" then the * is expanded according to the normal expansion rules. To suppress this one would have to quote the variable, as shown by marco: echo "$test". Alternatively, if you get rid of the asterisk before you echo it, all will be fine, e.g. echo ${test:2} will just echo "master". Alternatively you could assign it anew as you already proposed:

branch=${test:2}
echo $branch

这将显示大师，就像你想要的。

This will echo "master", like you wanted.

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