如何在 OS X 中获取 Bash 版本号
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How to get Bash version number in OS X
提问by Sindhu S
I am writing a install script which needs Bash 4.x. This install script can be used on OSX too. I am aware that on Linux systems I can get Bash version by checking with echo $BASH_VERSIONenv variable but how do I get the bash version in Darwin? Running bash --versionwill give:
我正在编写一个需要 Bash 4.x 的安装脚本。这个安装脚本也可以在 OSX 上使用。我知道在 Linux 系统上我可以通过检查echo $BASH_VERSIONenv 变量来获得 Bash 版本，但是如何在 Darwin 中获得 bash 版本？运行bash --version将给出：
GNU bash, version 4.3.33(1)-release (x86_64-apple-darwin14.1.0)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
This is notthe output I want. I want the output to be just the version number, specially just the main version number.
这不是我想要的输出。我希望输出只是版本号，特别是主版本号。
回答by Brian Campbell
echo $BASH_VERSIONworks on Mac OS X as well:
echo $BASH_VERSION也适用于 Mac OS X：
$ echo $BASH_VERSION
3.2.57(1)-release
If you need to check if they have a newer bash installed, (such as via Homebrew or MacPorts) by calling the bashthat is in their path, you can just execute that command from within that version of bash:
如果您需要通过调用bash路径中的来检查他们是否安装了较新的 bash（例如通过 Homebrew 或 MacPorts），您可以从该版本中执行该命令bash：
$ bash -c 'echo $BASH_VERSION'
4.3.30(1)-release
To get just one component of the version, there is an array, BASH_VERSINFO, so you can access each element individually. If you just want the major version (this is on my system, where my login shell is Bash 3 but I have Bash 4 installed for scripting):
为了仅获取版本的一个组件，有一个数组, BASH_VERSINFO，因此您可以单独访问每个元素。如果您只想要主要版本（这是在我的系统上，我的登录 shell 是 Bash 3，但我安装了 Bash 4 用于编写脚本）：
$ echo ${BASH_VERSINFO[0]}
3
$ bash -c 'echo ${BASH_VERSINFO[0]}'
4
You can see the full contents of the array as well:
您还可以看到数组的完整内容：
$ echo "${BASH_VERSINFO[@]}"
3 2 57 1 release x86_64-apple-darwin14
$ bash -c 'echo "${BASH_VERSINFO[@]}"'
4 3 30 1 release x86_64-apple-darwin14.0.0
回答by tcsapunaru
You can use the following one liner to extract the version number:
您可以使用以下一行来提取版本号：
bash --version | awk 'NR==1{print }'
user@ubuntu-server:~$ bash --version |awk 'NR==1{print $4}'
4.3.11(1)-release
user@ubuntu-server:~$ bash --version |awk 'NR==1{print $4}'
4.3.11(1)-发布
回答by Mark Setchell
I seem to be able to use this:
我似乎可以使用这个：
echo ${BASH_VERSINFO[0]}
3
echo ${BASH_VERSINFO[1]}
2
echo ${BASH_VERSINFO[2]}
57
and
和
echo $BASH_VERSION
3.2.57(1)-release
