6.linux file permissions and directory configuration

First, the System user group:

1. See which user groups the system has:

1.1 Cat/etc/group View all user groups in the system

1.2 Groups view the members of the currently logged in user group

2. Create a user group:

2.1 Groupadd Test_group

3. Modify a user group:

3.1 Groupmod-n NewGroup Oldgroup

4. Delete a user group

4.1 Groupdel testgroup2

Second, the system users:

1. See which users are on the system:

1.1 cat/etc/passwd can view a list of all users

2. Create a User:

2.1 Useradd testuser1 Create user

2.2 passwd testuser1 set new user password

2.3 Usermod-a-G testgroups testuser1 set new User (TestUser1) user Group (testgroups)

3. Modify the User:

3.1 usermod-l testuser3 testuser1 Modify user name

4. Delete the User:

4.1 userdel-r testuser3 Delete User

Third, System files:

1. View file properties

1.1 Ls-al View all properties of the file, 1 is the file type, 234 is the owner permission, 567 is the same user group permission, 890 is other user rights

2. modifying file properties

2.1 Chgrp testgroups Hzc Modify the folder to which the user group belongs

2.2 Chown TestUser2 Hzc Modify folder to belong to user

2.3chmod r:4 w:2 x:1 Modify folder permissions

6.linux file permissions and directory configuration