[Linux Learning]—Common Linux Instructions (1)
1. Group management and permission management
Every user in Linux must belong to a group and cannot be independent from outside the group.
1️⃣Owner
Generally, it is the creator of the file. Whoever created the file automatically becomes the owner of the file.
View the owner of a file:ls -ahl
2️⃣The group you belong to
When a user creates a file, the group to which the file belongs is the group to which the user belongs.
3️⃣Other groups
Except for the owner of the file and the users in its group, all other users of the system are other groups of the file.
usermod -g wuudang zwj
2. Basic introduction to permissions
chmod 755 /home/abc.txt
3. Practice
[root@study user]# groupadd police
[root@study user]# groupadd bandit
[root@study user]# useradd -g police jack
[root@study user]# useradd -g bandit jerry
[root@study user]# useradd -g bandit xh
[root@study user]# useradd -g bandit xq
4. crond task scheduling
