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This article mainly explains "how to create users and groups in linux". Friends who are interested may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to create users and groups by linux.

There are three types of users under linux: 1. Superuser: root has all the permissions of operating system uid 0

2. Ordinary users: ordinary users have limited permissions of the operating system uid 500-6000

3. Pseudo users: in order to facilitate system management and meet the requirements of the corresponding system process file owners, they cannot log in to the system uid 1 Murray 499.

Manage the user's files and basic information here / etc/passwd any user has the right to read it, only define the account, not the password.

One line represents a user, divided into seven parts.

Account name: password: uid:gid: related information: user's home directory: interpreter

The user's password file / etc/shadow is readable only by root

User name: password: last modified time: maximum time interval: minimum time interval: warning time: inactivity time: failure time

0 can be modified at any time 999999 a week

Two simple ways to create an account

1 add a record to / etc/passwd

2 # ueradd user # passwd password (lee user's affiliated group is admin)

View the user's information:

Common options for the useradd command are as follows:

-d home-dir: specify the user's home directory.

-e date: the date on which the account is disabled in the format: YYYY-MM-DD.

-f days: the number of days before the account is disabled after the password expires.

-g group-name: the group name or GID of the primary group to which the user belongs.

-G group-list: a list of affiliated groups to which the user belongs. Multiple items are separated by commas.

-m: create a home directory if it does not exist.

-M: no user home directory is created.

-n: do not create private groups for users.

-r: create a system account with a UID less than 500 without a home directory.

-p: encrypted password.

-s: specifies that the user logs in to Shell. The default is / bin/bash.

-u UID: specifies the user's UID, which must be unique and greater than 499

Deletion of users:

User's disable:

User's unlock:

Modification of user login name:

(where there is a locked user, there is a locking password, which forbids the user from logging in to the system. This method is not only mentioned above, but will not be exemplified one by one.)

Profile / etc/group for the group

Group name group password group id other users

Creation and deletion of groups (deletion of groups is different from that of users)

Creation and deletion of group passwords

What if I really don't know? View help. Man or-- help

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