shutdown -r NOW
halt
reboot
not working for you?
To force a shutdown:
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
echo b > /proc/sysrq-trigger
And for a reboot:
echo 1 > /proc/sys/kernel/sysrq
echo o > /proc/sysrq-trigger
echo o > /proc/sysrq-trigger
Thanks to Nasser Heidari for the tip.