'winrar' is not recognized as an internal or external command, operable program or batch fil

'winrar' is not recognized as an internal or external command,
operable program or batch file.

默認安裝完winrar後，命令行是不支持winrar命令的，會報以上錯誤。

解決辦法：需要設置環境變量，path 值爲 winrar的安裝路徑。

如果path裏面設置過其他的環境變量，值裏面各路徑需要用分號隔開。