CloudFoundry命令行安装和卸载插件

使用以下的命令行安装CloudFoundry命令行插件：

$ cf install-plugin multiapps-plugin.win64 -f

遇到以下错误消息：
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，由于我现有的CloudFoundry插件，其提供的命令和即将安装的插件出现冲突了，好比二者都提供cf deploy命令。所以要先将已安装的插件卸载。

Google找到卸载插件的作法：

cf uninstall-plugin MtaPlugin

卸载旧的插件以后，安装成功。

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