Features of/proc/sysrq-trigger files

http://blog.csdn.net/choice_jj/article/details/7965676

Restart the computer now echo "B" >/proc/sysrq-trigger

Turn off the computer now echo "O" >/proc/sysrq-trigger

Export memory allocation information echo "M" > Proc/sysrq-trigger (can be viewed with/var/log/message) outputs memory statistics to the console

Export current CPU register information and flag bit information echo "P" > Proc/sysrq-trigger (Outputs all flags and registers to the console)

Export thread state information echo "T" > Proc/sysrq-trigger (Outputs a list of processes to the console)

Deliberately let the system crash echo "C" > Proc/sysrq-trigger (Crashes "system without"-unmounting file systems or S Yncing disks attached to the system)

Immediately reload all file systems echo "S" > Proc/sysrq-trigger (attempts to sync disks attached to the system)

Immediately reseat all file systems as read-only echo "U" > Proc/sysrq-trigger (Attempts to unmount and remount all file systems as Read-only)

In addition, there are two features that are similar to mandatory logoff

E----kills all processes except init using Sigterm

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