/proc/sysrq-trigger文件的功能

立即重启计算机 echo "b" > /proc/sysrq-trigger

立即关闭计算机 echo "o" > /proc/sysrq-trigger

导出内存分配的信息 echo "m" > proc/sysrq-trigger (可以用/var/log/message查看)Outputs memory statistics to the console

导出当前CPU寄存器信息和标志位的信息 echo "p" > proc/sysrq-trigger (outputs all flags and registers to the console)

导出线程状态信息 echo "t" > proc/sysrq-trigger (outputs a list of processes to the console)

故意让系统崩溃 echo "c" > proc/sysrq-trigger
(crashes the system without first unmounting file systems or syncing disks attached to the system)

立即重新挂载所有的文件系统 echo "s" > proc/sysrq-trigger (attempts to sync disks attached to the system)

立即重新挂载所有的文件系统为只读 echo "u" > proc/sysrq-trigger (attempts to unmount and remount all file systems as read-only)

此外，还有两个类似于强制注销的功能

e ---- kills all processes except init using SIGTERM

i ---- kills all processes except init using SIGKILL