Init, Upstart, Systemd

http://www.tutorialspoint.com/unix_commands/init.htm
http://www.yolinux.com/TUTORIALS/LinuxTutorialInitProcess.html

Quik Notes:
dd if=/dev/zero of=/dev/sda
dd -> writes stuffs (like, bit for bit, cylinder for cylinder, etc)

dd if=/dev/zero
write using input file /dev/zero (all zeros)

of=/dev/sda
output and overwrite /dev/sda (first ATA/SCSI/SATA/SAS drive on system (meaning, your hard drvie).
so, the command wiped out everything on your hard drive.

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