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Emergency Reboot

echo 1 > /proc/sys/kernel/sysrq 
echo b > /proc/sysrq-trigger

synonymous with holding down Alt-SysRq and another key on older keyboards

Dropping 1 into /proc/sys/kernel/sysrq tells the kernel that you want to enable SysRq access (it’s usually disabled).

The second command is equivalent to pressing Alt-SysRq-b on a QWERTY keyboard.

If you want to keep SysRq enabled all the time, you can do that with an entry in your server’s sysctl.conf:

kernel.sysrq = 1

Ref: Linux: emergency reboot or shutdown with magic commands - -

Emergency Shutdown

echo 1 > /proc/sys/kernel/sysrq 
echo o > /proc/sysrq-trigger