锁定屏幕
KDE桌面: qbus org.freedesktop.ScreenSaver /ScreenSaver Lock
gnome桌面: gnome-screensaver-command -l
退出登陆
KDE桌面:qdbus org.kde.ksmserver /KSMServer org.kde.KSMServerInterface.logout -1 -1 -1
gnome桌面: gnome-session-quit
不想要弹窗确认警告,就加参数-quit --no-prompt,执行:gnome-session-quit --no-prompt