json 如何找出实际安装的 bower 包的版本？
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How do I find out what version of a bower package is actually installed?
提问by Andrew Ferrier
Normally a bower.jsonfile specifies some dependencies, but these are typically expressed so that they allow a range of versions of a bower package to be used (e.g. >=1.0, which means anything higher than version 1.0).
通常一个bower.json文件指定了一些依赖项，但这些通常被表达为允许使用一系列版本的 bower 包（例如>=1.0，这意味着任何高于 1.0 的版本）。
I have an automated process which needs to find what version of a bower package is actually installedon this system right now.
我有一个自动化过程，需要查找当前系统上实际安装了哪个版本的 Bower 软件包。
How can I find this out programmatically (just the version itself), ideally using standard Unix command line tools / the bower command?
我如何以编程方式（仅版本本身）找到它，理想情况下使用标准 Unix 命令行工具/ bower 命令？
bower info <thepackagename>does notshow this - it shows information about what is currently available from the bower repository (for example, even if I do bower info apackageIdonthaveinstalledit will still show a valid JSON structure containing a version number).
bower info <thepackagename>并没有表明这一点-它显示了什么是当前可从凉亭库信息（例如，即使我做bower info apackageIdonthaveinstalled它仍然会显示一个包含版本号的有效的JSON结构）。
cat bower_components/thepackagename/bower.json | node_modules/json/lib/json.js versionworks for some packages (assuming the npm package jsonis installed), but not all (e.g. jquery 2.2.0's bower package does not contain a bower.json).
cat bower_components/thepackagename/bower.json | node_modules/json/lib/json.js version适用于某些软件包（假设json安装了 npm 软件包），但不是全部（例如 jquery 2.2.0 的 bower 软件包不包含 bower.json）。
采纳答案by Andrew Ferrier
The best approach I've now found, which seems to work for every package I've come across so far, is:
我现在找到的最好的方法是：
cat bower_components/thepackagename/.bower.json | node_modules/json/lib/json.js version
cat bower_components/thepackagename/.bower.json | node_modules/json/lib/json.js version
(note the extra .in .bower.json).
（注意额外.的.bower.json）。
It would appear that bower stores some metadata about the installed package in .bower.json, and that includes the installed version.
看起来 bower 在 中存储了一些关于已安装包的元数据.bower.json，其中包括已安装的版本。
The best I've come up with so far is:
到目前为止我想出的最好的是：
bower list | grep jquery | perl -pe 's/.*jquery#(.*?) .*$//'
(if, for example, the package I was interested in was jquery).
That's pretty ugly for a variety of reasons:
I have to repeat the package name (although this could probably be improved with a better Perl script which filters lines too, I'm just being lazy).
bower listgets information about all installed packages, not just the one I'm interested in - the rest of the information is discarded.bower listseems to require internet connectivity to check the registry, otherwise it fails.
bower list | grep jquery | perl -pe 's/.*jquery#(.*?) .*$//'
（例如，如果我感兴趣的包是jquery）。
由于各种原因，这非常难看：
我必须重复包名（虽然这可能可以通过更好的 Perl 脚本来改进，它也过滤行，我只是懒惰）。
bower list获取有关所有已安装软件包的信息，而不仅仅是我感兴趣的信息 - 其余信息将被丢弃。bower list似乎需要互联网连接来检查注册表，否则它会失败。
Would be interested to see if this could be improved upon, particularly the last point.
有兴趣看看这是否可以改进，尤其是最后一点。
回答by Artem Vasiliev
Here's a grep command to do that:
grep "version\"\:" bower_components/thepackagename/.bower.json
这是执行此操作的 grep 命令：
grep "version\"\:" bower_components/thepackagename/.bower.json
Also, a command to see versions of all bower components for the project - this list can be a handy CI artefact:
grep "version\"\:" bower_components/*/.bower.json
此外，还有一个用于查看项目所有 bower 组件版本的命令——这个列表可以是一个方便的 CI 人工制品：
grep "version\"\:" bower_components/*/.bower.json
回答by yujohnnyzhou
Have you ever tried "bower list --json=0 --offline".
您是否尝试过“凉亭列表 --json=0 --offline”。
It would list all bower packages info.
它将列出所有凉亭包信息。
