使用如下的命令行安装CloudFoundry命令行插件：
$ cf install-plugin multiapps-plugin.win64 -f
遇到如下错误消息：
Attention: Plugins are binaries written by potentially untrusted authors.
Install and use plugins at your own risk.
Plugin multiapps v2.2.1 could not be installed as it contains commands with names and aliases that are already used: bg-deploy, deploy, download-mta-op-logs, mta, mta-ops, mtas, purge-mta-config, undeploy, dmol. FAILED
google发现，因为我现有的CloudFoundry插件，其提供的命令和即将安装的插件出现冲突了，比如两者都提供cf deploy命令。因此要先将已安装的插件卸载。
Google找到卸载插件的做法：
cf uninstall-plugin MtaPlugin
卸载旧的插件之后，安装成功。
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