The following lines were added (+) and removed (-):
System V is a System Manager for UNIX / Linux. In Linux/Unix based operating systems, init (short for initialization) is the first process that started during the system boot up by the kernel. System V is not specific to Linux. It dates back to 1983 for UNIX. System V was the successor to 1982's UNIX System III. UNIX System V and the Berkeley Software Distribution (BSD) were the two major version of UNIX.System V versus Systemd - Systemd is a new init system and system manager which was adapted by most of the major distribution. Discussion on the three current Linux System Managers#Sys V - Used by all major linux distributions in the past until being replaced by Upstart and systemd.#Upstart - developed for Ubuntu and used in Ubuntu from 9.10 to Ubuntu 14.10 & RHEL 6#systemd - systemd is compatible with SysV and LSB init scripts. First appeared in Fedora 15. How to tell which one your system is using: type the following at command prompt ps -p1 | grep "init\|upstart\|systemd"