Linux User Management

Configuration file

User Information file:/etc/passwd

One line with 7 messages man 5 passwd

Root:x:0:0:root:/root:/bin/bash

User name: Password bit: User uid: Default group GID: Description information: default directory after user login: command interpreter (user is using shell, default is bash)

Password file:/etc/shadow

You can add users to add account password in/etc/passwd add account/etc/shadow directly with VI

User Configuration Files

/etc/login.defs

/etc/deafult/usreadd

Linux users are divided into three types:

Super user "Uid=0 root"

Normal user "UID 500-60000"

Pseudo-user "1-499" pseudo-user is related to system and program services, the pseudo-user cannot log into the system.

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User groups

Each user belongs to at least one user group

Why each user group includes multiple users

Users of the same user group have permissions shared by this group

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Linux User Management