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The main purpose of init is to start and stop essential processes on the system. There are three major implementations of init in Linux, System V, Upstart and systemd.[[Linux Sys V]] starts and stops processes sequentially. Sys V scripts start and stop services referencing runlevels which are set from 0 to 6.How to restart network in Ubuntu Server: /etc/init.d/networking restart script based command.How to restart network in Ubuntu Server: /etc/init.d/networking restart script based command.