Write a bash script create directories.sh that when the script is executed with three given arguments (one is the directory name and second is the start number of directories and the third is the end number of directories ) it creates a specified number of directories with a dynamic directory name.

 #!/bin/bash

 directory=$1
 start_day=$2
 end_day=$3

 for n in $(seq $start_day $end_day);
 do
   mkdir $directory$n
 done

Create a Script to back up all your work done till now.

 #!/bin/bash
 backup_dir="/home/ubuntu"
 backup_file="mybackup_$(date +"%Y%m%d_%H%M%S").tar.gz"
 tar -czf "$backup_dir/$backup_file" /home/ubuntu/

 if [ -f "$backup_dir/$backup_file" ]; then
   echo "Backup created successfully!"
 else
   echo "Error: Backup creation failed!"
   exit 1
 fi

Read About Cron and Crontab, to automate the above backup Script

 crontab -e
 * * * * * bash /home/ubuntu/backupscript.sh

The above command will create a backup script every 1 minute.

Create 2 users and just display their Usernames

 sudo useradd umang_pincha -m