The SYSRQ of Ledge under Linux

Reference:

• http://www.linuxfly.org/post/545/
• Http://www.jb51.net/article/13525.htm

Practice:

1. Rainy day

   Echo " 1 " >/proc/sys/kernel/sysrq

2. Aftermath in

   the event of a malfunction, and SYSRQ is open, and the keyboard is responsive (this means that kernel is not completely dead). You can use SYSRQ Dafa to invoke the relevant functionality in a standard QWERTY keyboard using the "alt+sysrq+ function Key" method.
   Common function Key combinations:
   R:switch the keyboard from raw mode to XLATE mode. Grab keyboard control from X Server (Unraw)
   E:send the SIGTERM signal to all processes except init. Send SIGTERM signals to all processes to resolve their own aftermath (TErminate)
   I:send the SIGKILL signal to all processes except init. Send SIGKILL signals to all processes and force them to close immediately (KILL)
   S:sync all mounted file systems (IMPORTANT). Sync all data to disk (sync)
   U:remount all mounted the file systems in Read-only mode. Mount all partitions as read-only mode (unmount)
   b:immediately reboot the system, without un-mounting partitions or syncing. Restart (reBoot)

The SYSRQ of Ledge under Linux