The books: bash for beginners & bash for advanced users
http://www.tldp.org/LDP/Bash-Beginners-Guide/html/index.html
http://tldp.org/LDP/abs/html/index.html
Brace Expansion
http://www.thegeekstuff.com/2010/06/bash-shell-brace-expansion/
Scripts avancés
https://dascritch.net/post/2018/01/08/En-20-lignes-pas-plus-%3A-g%C3%A9rer-les-options-d-appel-de-tes-scripts-bash
http://fr.wikibooks.org/wiki/R%C3%A9seaux_TCP/IP/La_pile_TCP/IP
https://fr.wikipedia.org/wiki/Suite_des_protocoles_Internet
https://fr.wikibooks.org/wiki/R%C3%A9seaux_TCP/IP
http://www.frameip.com
http://www.lalitte.com/index.php/Accueil
http://www.tldp.org/LDP/nag2/
https://vincent.bernat.im/fr/blog/2017-ipv4-table-routage-linux
https://betterexplained.com/articles/a-simple-introduction-to-computer-networking/