User account creation is one of the basic task for Linux administrator that everyone aware.
Here we are going to show you something interesting about the user creation in this article.It will help you to complete your task more quick and efficiently
We need to perform this task whenever a new employee is joining in our organization.But you don’t need to create an account for the new employee if the Linux system is integrated with AD for single sign on (SSO).
However, you need to assign the user in the corresponding local group based on his role and department.
Everyone knows the user information was residing in
/etc/passwd file. It’s a text file that contains the essential information about each user.When we create a new user, the new user details will be appended into this file.
While creating a new users the below four files will be modified.
/etc/passwd:User details will be updated in this file.
/etc/shadow:User password info will be updated in this file.
/etc/group:Group details will be updated of the new user in this file.
/etc/gshadow:Group password info will be updated of the new user in the file.
It can be done through three commands.
useradd:Create a new user or update default new user information.
adduser:Create a new user with all default parameters or update default new user information.
newusers:update and create new users in batch.
If you would like to read the related articles about user management then you can navigate to the following articles.
- How to Update/Change Users Password in Linux Using Different Ways
- How To Force User To Change Password On Next Login In Linux
- How to Reset/Change User’s Password in Linux Using passwd Command?
- How To Check Password Complexity/Strength And Score In Linux?
- 6 Easy Ways to Check User Name And Other Information in Linux
- 3 Methods to List All The Users in Linux System
How to create an user accounts in Linux using useradd command?
The useradd command creates a new user account using the default values which was specified on the
useradd -D command output.
The useradd command will update system files and also create the new user´s home directory and copy initial files.
# useradd thanu
If you create a new account, you should set the password to that account. Use the
passwd command to set password.
# echo "new_password" | passwd --stdin thanu Changing password for user thanu. passwd: all authentication tokens updated successfully.
How to create an user accounts in Linux using adduser command?
adduser is not a standard Linux command. It creates a new user with all default parameters which is not available in the useradd command. However, it uses useradd command in the background to perform this task.
Also, it adds a password for the user while creating.
# adduser renu Adding user `renu' ... Adding new group `renu' (1002) ... Adding new user `renu' (1002) with group `renu' ... Creating home directory `/home/renu' ... Copying files from `/etc/skel' ... Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully Changing the user information for renu Enter the new value, or press ENTER for the default Full Name : Renu Room Number : Work Phone : 9600106327 Home Phone : Other : Is the information correct? [Y/n] Y
How to create bulk user accounts in Linux using newusers command?
The newusers command reads a given file and uses this information to update a set of existing users or to create new users.
Each line is in the same format as the standard password file.
Before performing this, we need to get the latest GID and UID from the passwd file.
# tail -5 /etc/passwd gdm:x:121:125:Gnome Display Manager:/var/lib/gdm3:/bin/false daygeek:x:1000:1000:daygeek,,,:/home/daygeek:/bin/bash sshd:x:122:65534::/run/sshd:/usr/sbin/nologin thanu:x:1001:1001::/home/thanu:/bin/sh renu:x:1002:1002:Renu,,9600106327,:/home/renu:/bin/bash
Create a file called
user-add.txt and the details should be in the following format. Each user line should be in the separate line.
I have added the five users in the file. List out the users using cat command.
# cat user-list.txt 2gadmin:2gadmin123:1003:1003::/home/2gadmin:/bin/bash testuser:testuser123:1004:1004::/home/testuser:/bin/bash demouser:demouser123:1005:1005::/home/demouser:/bin/bash sudha:sudha123:1006:1006::/home/sudha:/bin/bash suresh:suresh123:1007:1007::/home/suresh:/bin/bash
newusers command with the filename to create bulk users in Linux system.
# newusers user-list.txt
We can double confirm this by running the following command.
# grep "2gadmin\|testuser\|demouser\|sudha\|suresh" /etc/passwd 2gadmin:x:1003:1003::/home/2gadmin:/bin/bash testuser:x:1004:1004::/home/testuser:/bin/bash demouser:x:1005:1005::/home/demouser:/bin/bash sudha:x:1006:1006::/home/sudha:/bin/bash suresh:x:1007:1007::/home/suresh:/bin/bash
How to create bulk user accounts in Linux using useradd command with Shell script?
Use the below script if you would like to create a multiple users in Linux system.
I have added below three users in the file. Use any file command to List out the users which isthere in the file.
# cat user-list1.txt user1 user2 user3
Create the following shell script to achieve this.
# vi user-add.sh #!/bin/sh for user in `more user-list1.txt` do echo "$user" useradd $user echo "[email protected]" | passwd --stdin "$user" chage -d 0 $user done
Set an executable permission to
# chmod +x user-add.sh
Finally run the script to achieve this.
# sh user-add.sh user1 Changing password for user user1. passwd: all authentication tokens updated successfully. user2 Changing password for user user2. passwd: all authentication tokens updated successfully. user3 Changing password for user user3. passwd: all authentication tokens updated successfully.
We can double confirm this by running the following command.
# grep "user1\|user2\|user3" /etc/passwd user1:x:1008:1008::/home/user1:/bin/sh user2:x:1009:1009::/home/user2:/bin/sh user3:x:1010:1010::/home/user3:/bin/sh
2 Comments on “Three methods to create User accounts in Linux?”
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