If you want to reset the Linux machine, just like when you press the reset button then you need to use the SysRq method. As per wikipedia “The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system’s state. It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem.” We normally use a key combination but its also possible to do the same operation by using /proc/sysrq-trigger effectively.
But before doing anything we need to enable that feature using the below method.
echo "1" > /proc/sys/kernel/sysrq #or add permanently by adding an entry to /etc/sysctl.conf: kernel.sysrq = 1
echo b > /proc/sysrq-trigger
echo s > /proc/sysrq-trigger
echo c> /proc/sysrq-trigger
For more information check this out