How to create a user by using Shell Script on Oracle Linux 8.5

To Create A User By Using Shell Script On Oracle Linux 8.5

Introduction:

Shell scripts are text files that contain commands for UNIX-based operating systems.

In Linux, shell scripting is an essential part of process automation. A script is a way to write a sequence of commands and then execute them.

Introduction Procedure:

Step 1: Check the Oracle Linux Version by using the below command

[root@linuxhelp ~]$ cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="8.5"

Step 2: Create a text file userlist with all the usernames by using the below command.

[root@linuxhelp ~]$ vim /tmp/userlist
user1
user2

Step 3: Creating a script file to write the script by using the below command.

[root@linuxhelp ]# vim /usr/sbin/createuser.sh
#execute the Script using a bash shell
#!/bin/bash
#//location of the txt file of usernames
userfile=/tmp/userlist
#extracting usernames from the file one-by-one
username=$(cat /tmp/userlist | tr 'A-Z'  'a-z')
#defining the default password
password=Admin@123
#running loop  to add users
for user in $username
do
       #//adding users '$user' is a variable that changes
      # // usernames accordingly in txt file.
       useradd $user
       echo $password | passwd --stdin $user
done

echo "$(wc -l /tmp/userlist) users have been created"
tail -n$(wc -l /tmp userlist) /etc/passwd
~

Step 4: Give permissions to the script file by using the below command.

[root@linuxhelp ~]# chmod 775 /usr/sbin/createuser.sh

[root@linuxhelp ~]# sh /usr/sbin/createuser.sh
Changing password for user user1.
passwd: all authentication tokens updated successfully.
Changing password for user user2.
passwd: all authentication tokens updated successfully.
2 /tmp/userlist users have been created
wc: /tmp: Is a directory
wc: userlist: No such file or directory
/usr/sbin/createuser.sh: line 24: /root: Is a directory

[root@linuxhelp ~]$ cat /etc/passwd
user1:x:1001:1001::/home/user1:/bin/bash

user2:x:1002:1002::/home/user2:/bin/bash

[root@linuxhelp ~exit

[linux@linuxhelp ~]$ su user1
Password: 
[user1@linuxhelp linux]$

[linux@linuxhelp ~]$ su user2
Password: 
[user2@linuxhelp linux]$ 

[user2@linuxhelp linux]$ cd /home
[user2@linuxhelp home]$ ls
linux  user1  user2