CheckBin 检查二进制是否存在.

DownloadFile 下载文件.

Exec cli commands.

HandlePluginCommand receives a pluginHandler and command-line arguments and attempts to find a plugin executable on the PATH that satisfies the given arguments.

NewDefaultPluginHandler instantiates the DefaultPluginHandler with a list of given filename prefixes used to identify valid plugin filenames.

RunCmd is exec on os ,no return.

RunCmdRes is exec on os , return result.

DefaultPluginHandler implements PluginHandler.

PluginHandler is capable of parsing command line arguments and performing executable filename lookups to search for valid plugin files, and execute found plugins.