Question

Please write shell scripts in Kali Linux to complete the following tasks.

Task A - Take your UIN

Write a script like below that reads and displays the MIDAS ID if the following requirements are satisfied:

1. Only lower case letter [a-z] and numeric character[0-9] are allowed

2. MIDAS ID must between 4 to 8 digits

Test your script with the following examples:

• Your MIDAS ID in lower case

• Your MIDAS ID w.one upper case

• A string less than 4 digits

• A string longer than 8 digits

0. Task B - Check files

   Write a script like below that gets a list of files in a directory you entered, plus your name. Your script should pop out an error if an invalid directory is entered.

   You need to test the following directories with your script:

   • /etc/systemd

   • /home

   • A directory that does not exist

Answer 1

The folowing ode is given below

Code:

#!/bin/bash
echo Enter your ODU MIDAS ID:
while true
do
        
        read id
        LEN=$(echo ${#id})
        if ((LEN < 4 || LEN > 8)); then
                echo "You must enter a valid midaS ID - four to eight digits only!"
                echo "Please re-enter yout MIDAS ID:"
                continue        
        fi
        if [[ "${id}" =~ [^a-z0-9] ]]; then
                echo "You must enter a valid midaS ID - four to eight digits only!"
                continue
        fi
        echo "Thank you, your MIDAS ID is: "$id
        break
done

Output Screenshot

TASK B:

#!/bin/bash
echo Enter the name of the directory you want to check:
read dir
echo Enter your name:
read name
out=$(ls $dir -1a 2> /dev/null)

if [ ${#out} == 0 ]; then
        echo Sorry, $name, $dir is not a valid directory name!
else echo "Hello $name!" && echo "Below are the contents in the requested directory: $dir" && ls $dir -1a 2> /dev/null
fi