• Exercise 2: Write a script that print all even number from n1 to n2, n1 and 2 are provided by user. (while loop)
Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
![# ! /bin/bash
press_enter()
{
echo -en "\nPress Enter to continue"
read
clear
selection=
until [ "$selection" = "0" ]; do
echo
PROGRAM MENU
1 - display free disk space
2 - display free memory
0 - exit program
%3D
echo -n "Enter selection: "
read selection
echo
case $selection in
1 ) df ; press_enter ;;
2 ) free ; press_enter ;;
0 ) exit ;;
* ) echo "Please enter 1, 2, or 0"; press_enter
esac
done](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F96c9ad75-74d4-452c-bed3-333b6aae039e%2F3c0c91df-e4d9-4598-ad1c-684a802b6b61%2Fz8y4mxv_processed.jpeg&w=3840&q=75)
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