Alt-SySRQ-B immediately reboot the system without syncing or unmounting disks
Alt-SySRQ-E send SIGTERM signal to all processes, except for init
Alt-SySRQ-H display help (actually any other key than those listed above will display help but 'h' is easy to remember
)
Alt-SySRQ-I send a SIGKILL to all processes, except for init
Alt-SySRQ-K kills all programs on the current virtual console. (Secure Access Key/SAK)
Alt-SySRQ-L send a SIGKILL to all processes, including init
Alt-SySRQ-M dump current memory info to console
Alt-SySRQ-O system shut off (if configured and supported)
Alt-SySRQ-P dump the current registers and flags to console
Alt-SySRQ-R keyboard in raw mode
Alt-SySRQ-S sync mounted filesystems
Alt-SySRQ-T dump a list of current tasks and their information to console
Alt-SySRQ-U remount all mounted file systems read-only
Alt-SySRQ-[0-9] sets the console log level, controlling which kernel messages will be printed to your console. ('0', for example would make it so that only emergency messages like PANICs or OOPSes would make it to console)
