�进程
~~~

### :ProcessOption
~~~nim
ProcessOption = enum                ## 传递给 startProcess 的配置
    poEchoCmd,                      ## echo the command before execution
    poUsePath,                      ## Asks system to search for executable using PATH 
                                    ## environment variable. On Windows, this is the default.
    poEvalCommand,                  ## Pass \`command\` directly to the shell, without quoting.
                                    ## Use it only