如何确保 yum install 在 shell 脚本中成功？
我有一个 shell 脚本，它检查是否有互联网连接（通过 ping google），然后调用
yum install packageA packageB --assumeyes
How will I recognize that the packages were displayed（或已经安装）？我是否再次进行 yum 调用并解析输出（我认为如果系统使用另一种语言，这会变得非常复杂）？
I have a shell script which checks if there is an internet connection (by pinging google), and then calls
yum install packageA packageB --assumeyes
How would I confirm that the packages were installed (or were already installed)? Do I make another yum call and parse the output (I presume this gets very complicated if the system is in another language)?
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我使用了以下方法，这可能不是万无一失的，但似乎有效：
假设变量
PACKAGES包含您要安装的软件包列表，然后：yum -y install $PACKAGES（我假设如果这是一个脚本，您确实希望传递-y以避免提示）。package;每次失败都不会安装 。仅当
PACKAGES包含yum预计在存储库中找到的纯包名称时才有效，如果它包含yum接受的其他内容则无效例如 URL、文件名或Provides:名称。I've used the following method, which might not be foolproof, but seems to work:
Assuming the variable
PACKAGEScontains the list of packages you want to install, then:yum -y install $PACKAGES(I assume if this is a script, you really want to pass-yto avoid prompting).rpm --query --queryformat "" $PACKAGES, which will output nothing for each package that was installed successfully, and will outputpackage <name> is not installedfor each failure.This will only work if
PACKAGEScontains plain package names thatyumis expected to find in a repository, not if it contains other things thatyumaccepts like URLs, file names orProvides:names.基于 此随机帖子< /a>，看起来 yum 返回一个错误代码到 shell。您可以通过运行命令然后立即（作为下一个命令）执行以下操作来测试这一点：
这将打印上一个命令的返回代码。成功应该是 0，失败应该是非零。但这只是一个猜测，因为我目前没有可用的盒子。 :)
Based on this random post, it looks like yum returns an error code to the shell. You can test this out by running a command and then immediately (as the next command) doing:
That will print the previous command's return code. Success should be 0, failure of some kind nonzero. But that's just a guess since I don't have a box accessible to me at the moment. :)
通过 ping google.com 不能确保您尝试连接的 yum 存储库可用
检查软件包是否已安装的命令：-
By ping google.com does not ensure the yum repo you trying to connect is available
The command to check whether a package is already installed :-