Lecture # 5 - Repetitive Structure in Shell Script

Repetitive Structure in Shell Script:

In shell scripting, repetitive structures such as loops are used to execute a block of code multiple times, typically based on certain conditions or a predefined number of iterations. The two most commonly used types of loops in shell scripting are the for loop and the while loop.

for Loop:

The for loop is used to iterate over a list of items, such as a sequence of numbers, filenames, or elements of an array. Its syntax is:

for variable in list
do
    # Commands to be executed for each iteration
done

while Loop:

The while loop is used to execute a block of code repeatedly as long as a specified condition is true. Its syntax is:

while [ condition ]
do
    # Commands to be executed repeatedly
done

break Statement:

Within loops, you can use the break statement to exit the loop prematurely.

continue Statement:

Within loops, you can use the continue statement to skip the current iteration and proceed to the next iteration.