Linux Account Management

Linux System User Classification

User account:

Super User Program user general user

Group account:

Basic Group additional groups

UID and GID

/etc/passwd The user information is saved

/etc/shadow password information saved

/etc/group The group information is saved

User Information field Analysis

Test:x:500:500:zheshimiaoshu:/home/test:/bin/bash

User name: Password placeholder: uid:gid: User information: User home directory: landed Shell

Field 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7

Password Information file field analysis

First column: User name second column: sha-512 encrypted password third column: Distance January 1, 1970 Password last modified (days)

Fourth column: Minimum password validity period fifth column: Maximum password duration Sixth column: Seven days before password expires warning

Seventh column: Password inactive period eighth column: Account expiration time distance January 1, 1970 Unit is (days)

Column Nineth: Unassigned Features

Linux Account Management