How to use loops in bash or shell script with examples.

Here we will see the way of using Loops in bash or shell script

As we all knows In computer programming, a loop is a sequence of instructions that is continually repeated until a certain condition is reached.

For loop syntax

for (( initializer; condition; step ))
do
   statement      
done

While loop syntax

while [ condition ]
do
 statement
done

Until Loop syntax

until [ condition ]
do
  statement
done

Execution

$ ./loop.sh 

Output

1
2
3
4
5
6
7
8
9
10
For Loop
1
2
3
4
5
6
7
8
9
10
Sum of all digits
Enter a number: 443
Sum=11
Largest of n nubmers
How many numbers: 5
Enter Numbers
23
4
5123
432
4
Max number is 5123
0
1
2
3
4
5
6
7
8
9
10

Hope this may help you.