telint命令用于切换当前正在运行的Linux系统的运行等级
Send control commands to the init daemon.
--help Show this help
--no-wall Don't send wall message before halt/power-off/reboot
Commands:
0 Power-off the machine
6 Reboot the machine
2, 3, 4, 5 Start runlevelX.target unit
1, s, S Enter rescue mode
q, Q Reload init daemon configuration
u, U Reexecute init daemon