https://openclassrooms.com/courses/reprenez-le-controle-a-l-aide-de-linux
le shell bash:
https://www.fun-mooc.fr/courses
/https%3A%2F%2Fprofilepics.canalblog.com%2Fprofilepics%2F8%2F0%2F803567.jpg)
/https%3A%2F%2Fassets.over-blog.com%2Ft%2Fcedistic%2Fcamera.png)
/https%3A%2F%2Fp0.storage.canalblog.com%2F02%2F74%2F575305%2F134270963.jpg)
/https%3A%2F%2Fstorage.canalblog.com%2F06%2F86%2F921129%2F134157093_o.jpg)