Linux Users and user groups

User Category

Points by Location: Local account, remote account

by function: Normal user, Superuser (root)

Normal User:

(1) system User:UID 1-499

(2) Local Users:UID

Each user has a user group with the same name.

User, group configuration file:

User User groups

(1) account information /etc/passwd/etc/group

(2) password information /etc/shadow/etc/gshadow

the role of each field in the passwd:

Nologin Users:

Pseudo-user, used to invoke, differentiate processes.

the role of each field in the shadow:

Group configuration file:

/etc/group

Permissions

(1) Basic permissions

For file: R Read w write x Execute

For directory: R Read w Create, delete file x Enter

(2)

Commands to modify Permissions

chmod [ parameter ] file name

Modify Owner

Chown New owner : New owning group file name

Linux Users and user groups