#Day11 Advanced Linux Shell Scripting with User Management

Tasks:

1. Write a bash script CreateDirectories.sh that when the script is executed with three given arguments

This script will create a series of directories with names that are formed by concatenating the value of the variable “$1" with the values of the variable “$i” as it iterates through a range of values specified by “$2” and “$3”.

The script uses a “for” loop to iterate through the range of values specified by “$2” and “$3”. The loop variable “$i” is initialized to the value of “$2”, and the loop continues until “$i” is greater than “$3”. The body of the loop creates a new directory using the “mkdir” command and the value of “$1” concatenated with the value of “$i”.

#!/bin/bash

for ((i=$2;i<=$3;i++))
do
mkdir $1$i
done

It would create the following directories:

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

This script sets the current date and time, sets the directories for the backup and the work to be backed up, and creates the backup file using the “tar” command. The “tar” command creates a gzipped tar archive of the working directory and stores it in the specified backup file. Finally, the script prints a message indicating that the backup is complete.

You can run this script by making it executable and then running it with “./backup.sh”

3. About Cron and Crontab, to automate the backup Script

Cron is a daemon that runs in the background on Unix-like operating systems, including Linux and macOS. It allows you to schedule tasks to be automatically run in the background at a specified time or interval.

Crontab is a command that allows you to edit the cron table, which is a list of commands that are scheduled to run at specified times. Each line in the cron table represents a separate task, and consists of the following fields:

• Minute (0–59)

• Hour (0–23)

• Day of the month (1–31)

• Month (1–12)

• Day of the week (0–6, with 0 representing Sunday)

• Command to be run

  4. About User Management

  User management is the process of creating, modifying, and deleting user accounts on a computer system or network. It involves tasks such as setting passwords, permissions, and privileges for users, and is typically done using special tools provided by the operating system. User management is an important aspect of system administration, as it allows you to control who has access to the system and what actions they are allowed to perform.

  5. Create 2 users and just display their Usernames

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