linux user management

---------------------
crée un user:
	sudo useradd <USER> --password <PASS>
	----
	pour definir son mdp apres:
		passwd <USER>
	----
	delete un user:
		sudo userdel <USERS>
		add => <-r>

ajouter un user a un grupe existant:
	sudo adduser <user> <group>
	primary group:
		sudo usermod -g <primary_group> <user>

check le/les group d'un user:
	groups <USER>	

cat les user:
	cat /etc/passwd
	## cat /etc/shadow

modifier le nom d'un user:
	sudo usermod --login <new_id>  --home /home/<nv_id> --move-home <old_id>

-------------------- 
crée un groupe:
	sudo groupadd <group_name>

delete un group:
	sudo groupdel <group>

delete un user d'un group:
	gpasswd -d <USER> <group>

cat les groupes:
	cat /etc/group
	## cat /etc/gshadow

--------------------
voir les user sudoers:
	sudo cat /etc/sudoers
ajouter un sudoers:
	sudo visudo 
	## a la ligne """ # User privilege spe..."""
	on ajoute:
		<$USER>   ALL=(ALL:ALL) ALL

modifier le nom d'un group:
	sudo groupmod -n <nv_id> <old_id>

--------------------
PERMISSION:

changer le  ownership d'un fichier:
	sudo chown <user>:<group> <file>
	
-rwxrwxrwx ==> 777 ==> sudo chmod 777 <file>
-r-wr-wr-- ==> 554 ==> sudo chmod 554 <file>


chmod 700 * ==> -rwx------ for all file

ended by +:
	remove + :
		sudo chmod -N <file>
	apply +:
		setfacl -m <user>:<group>:<permission e.g = rw-> <file>
		
------------------
MOUNT

mount en root ==> sudo mount -o rwx,root,umask=0000 /dev/host /mnt/dest