/etc is one of the most important things in our Linux system
It contains all system related configuration files in here or in its sub-directories
A "configuration file" is defined as a local file used to control the operation of a program
It must be static and cannot be an executable binary. For this reason, it's a good idea to backup this directory regularly.
It will definitely save you a lot of re-configuration later if you re-install or lose your current installation. Normally, no binaries should be or are located here.
/etc/hosts: This file is used to define a system name and domain combination with a specific IP address. This file needs to always contain an entry for an IP address, if the machine is connected to the network.
### etherconf DEBCONF AREA. DO NOT EDIT THIS AREA OR INSERT TEXT BEFORE IT.
127.0.0.1 localhost ::1 localhost
ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
192.168.0.99 debian.localdomain.com debian
### END OF DEBCONF AREA. PLACE YOUR EDITS BELOW; THEY WILL BE PRESERVED.
192.168.0.1 ws001
/etc/apt: This is Debian's next generation front-end for the dpkg package manager. It provides the apt-get utility and APT dselect method that provides a simpler, safer way to install and upgrade packages. APT features complete installation ordering, multiple source capability and several other unique features, see the Users Guide in /usr/share/doc/apt/guide.text.gz
/etc/apt/sources.list: Contains a list of apt-sources from which packages may be installed via APT.
/etcis one of the most important things in our Linux system/etc/hosts: This file is used to define a system name and domain combination with a specific IP address. This file needs to always contain an entry for an IP address, if the machine is connected to the network./etc/apt: This is Debian's next generation front-end for the dpkg package manager. It provides the apt-get utility and APT dselect method that provides a simpler, safer way to install and upgrade packages. APT features complete installation ordering, multiple source capability and several other unique features, see the Users Guide in /usr/share/doc/apt/guide.text.gz/etc/apt/sources.list: Contains a list of apt-sources from which packages may be installed via APT.Source: http://www.tldp.org/LDP/Linux-Filesystem-Hierarchy/html/etc.html