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The editor today takes you to understand how to use commands to increase users in the Linux system. The knowledge points in the article are introduced in great detail. Friends who feel helpful can browse the content of the article with the editor, hoping to help more friends who want to solve this problem to find the answer to the problem. Let's follow the editor to learn more about "how to use commands to increase users in the Linux system".

Linux is a multi-tasking and multi-user system. The useradd or adduser command is used to establish the user account and the user's starting directory, and the permission is superuser.

The useradd or adduser command under Linux is used to set up a user account and create a user's starting directory, and the permission is superuser.

* Syntax: *

Useradd [parameters] name

* parameters: *

-c: add the comment text, which is saved in the remarks column of passwd. -d:-home-dir HOME_DIR specifies the home directory-e: specifies the expiration date of the account. The date format is MM/DD/YY, for example, 06ly30and12. The default means permanent. -f: specify how many days after the password expires to close the account. If the account is 0, it is disabled immediately; if it is-1, the account is always available. The default value is-1. -g:-gid GROUP specifies gid-G: specifies the additional group to which the user belongs. -l: do not add users to lastlog and failog, this user's login record does not need to be recorded.-m: automatically establish the user's login directory. -M: do not automatically create a user's login directory. -n: cancels the establishment of a group with the user name. -p:-password PASSWORD specifies the password of the new user-r:-system establishes a system account-s: specifies the shell to be used by the user after login. The default is / bin/bash. -u: specify the user ID number. This value must be unique in the system. 0room499 is reserved for system user accounts by default, so the value must be greater than 499.

* examples of usage: *

Non-root users need to temporarily adjust their permissions to execute useradd, preceded by sudo

* add a new user: user1*

Under root: useradd user1

Other users: sudo useradd user1

View the list of linux users: cat / etc/passwd

* add a new user: user2 and specify a user group: ftp*

Under root: useradd-g ftp user2

* add a new user: user4 and specify home directory: / mnt/bak/*

Under root: useradd-d / mnt/back/ user4

If there is no such directory, an error will be reported, and you will need to create the directory manually.

You need to change to create a directory under root, and login will be normal after creation. (you can also create sudo rights)

* add a new user: user5 and set the password to 123456 *

Under root: useradd-p 123456 user5

View linux user password: cat / etc/shadow

Add a new FTP user: ftp2018 (no need to log in to the system)

Under root: useradd-g ftp-s / sbin/nologin ftp2018

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