systemctl --help #查詢systemctl指令用法
systemctl list-units #查詢目前所有啟動中的服務
systemctl list-units -a #查詢目前所有已啟動及未啟動的服務
systemctl enable xxx.service #設定開機啟動xxx.service
systemctl disable xxx.service #設定開始不啟動xxx.service
systemctl stop xxx.service #立即停止xxx.service
systemctl start xxx.service #立即啟動xxx.service
systemctl status xxx.service #查詢xxx.serivce目前的狀態
systemctl list-units [--type=[service|socket|path] #依不同類型查詢啟動中的服務
systemctl is-enabled sshd #查詢服務是否設定開機啟動
systemctl is-active sshd #查詢服務是否正常啟動
systemctl list-unit-files #查詢服務啟動或是關閉狀態，以檔名顯示
Cited from kevin's blog.
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