/proc/sysrq-trigger文件的功能

立即重啓計算機      echo "b" > /proc/sysrq-trigger

立即關閉計算機      echo "o" > /proc/sysrq-trigger

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

導出當前CPU寄存器信息和標誌位的信息     echo "p"  > proc/sysrq-trigger       (outputs all flags and registers to the console)

導出線程狀態信息        echo "t"  > proc/sysrq-trigger          (outputs a list of processes to the console)

故意讓系統崩潰            echo "c"  > proc/sysrq-trigger         (crashes the system without first unmounting file systems or syncing disks attached to the system)

立即重新掛載所有的文件系統               echo "s"  > proc/sysrq-trigger     (attempts to sync disks attached to the system)

立即重新掛載所有的文件系統爲只讀     echo "u"  > proc/sysrq-trigger     (attempts to unmount and remount all file systems as read-only)

此外，還有兩個類似於強制註銷的功能

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

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