Please i need a help in bash script (linux) ,if im allowed just to use nested ifs,  i want to  take numbers from user and each number will execute some statements;  allowed inputs are 20,30,40.                                                        if the inputs entered were different then we should print a message "wrong number" and ask for entering again a number that is allowed. if  the input is 20 then it will execute :  echo "20989" if the input is 30 then it will execute3 :  echo "90999"  if the input is 40 then it will execute :  echo "40909 "

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Hello guys,

Please i need a help in bash script (linux) ,if im allowed just to use nested ifs,  i want to  take numbers from user and each number will execute some statements;  allowed inputs are 20,30,40.                                                        if the inputs entered were different then we should print a message "wrong number" and ask for entering again a number that is allowed.

if  the input is 20 then it will execute :  echo "20989"

if the input is 30 then it will execute3 :  echo "90999" 

if the input is 40 then it will execute :  echo "40909 "

Expert Solution
Answer

Bash Script:

while true
do
    echo "Enter a number"
    read num
    if [ $num -eq 20 ]
    then
        echo "20989"
        return
    elif [ $num -eq 30 ]
    then
        echo "90999"
        return
    elif [ $num -eq 40 ]
    then
        echo "40909"
        return
    else
        echo "wrong number"
    fi
done

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