Here is the explanation of the script:

This shell script calculates the total sum of numbers from 1 to 20 using a loop and displays the final result to the user.

Shebang (#!/bin/bash): Specifies which shell interpreter to run the script.
Variables: Used to store data (sum=0).
C-style for Loop: Iterates a block of code a specific number of times.
Arithmetic Expansion ($(( ... ))): Performs mathematical operations in Bash.

#!/bin/bash: Tells the system to execute this file using the Bash shell.
sum=0: Initializes a variable named sum to 0 to keep track of the total.
for (( i=1; i<=20; i++ )): A loop that:
- Starts counter i at 1.
- Runs as long as i is less than or equal to 20.
- Increments i by 1 after each pass (i++).
sum=$((sum + i)): Adds the current value of i to sum during each iteration.
echo "...": Prints the text and the final value of $sum to the terminal.

The sum of the first 20 numbers is: 210

Here is the explanation of the script:

This shell script calculates the total sum of numbers from 1 to 20 using a loop and displays the final result to the user.

Shebang (#!/bin/bash): Specifies which shell interpreter to run the script.
Variables: Used to store data (sum=0).
C-style for Loop: Iterates a block of code a specific number of times.
Arithmetic Expansion ($(( ... ))): Performs mathematical operations in Bash.

#!/bin/bash: Tells the system to execute this file using the Bash shell.
sum=0: Initializes a variable named sum to 0 to keep track of the total.
for (( i=1; i<=20; i++ )): A loop that:
- Starts counter i at 1.
- Runs as long as i is less than or equal to 20.
- Increments i by 1 after each pass (i++).
sum=$((sum + i)): Adds the current value of i to sum during each iteration.
echo "...": Prints the text and the final value of $sum to the terminal.

The sum of the first 20 numbers is: 210

Shell Script Programming