holiday12

2024-09-08 16:30:05

holiday12--linux basis

super user(root)

In linux, account root usually use for system maintain and managerment ,it has all access permission for all resources of system
In most linux system version,not recommended use root account log in system directly

sudo

su is abbreviation of substitute user , repersent use another user
sudo command used to execute commands in othter user , default identity is root

group managerment command

tips:add/delete group must execute as root

add/delete group

command	action
`groupadd` [group name]	add group
`groupdel` [group name]	delete group
`cat /etc/group`	make sure group information
`chgrp -R` [group name] [file/directory]	recursive modify the group of file directory

user managerment command

tips:add/delete user or modify other users password must execute as root

add/delete user and change password

command	action	description
`useradd -m -g` [grup] [new user]	add new user	`-m` automatically create home directory, `-g` appoint the user's group, otherwise will create a group which has same name with user
passwd user	set user's password	if you are normal user, you can use `passwd` command to change password directly
`userdel -r` [user name]	delete user	`-r` option will delete home directory automatically

cat /etc/passwd | grep [user name] #make sure user's information

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