#!/bin/bash

# Prompt the user to enter a number
read -p "Enter a number: " number

# Calculate the number of digits in the number
num_digits=${#number}

# Initialize a variable to store the sum of the digits raised to the power of the number of digits
sum=0

# Loop through each digit of the number and add it to the sum after raising it to the power of the number of digits
temp=$number
while [ $temp -gt 0 ]
do
  digit=$((temp % 10))
  sum=$((sum + digit**num_digits))
  temp=$((temp / 10))
done

# Check if the sum is equal to the original number
if [ $sum -eq $number ]; then
  echo "$number is an Armstrong number."
else
  echo "$number is NOT an Armstrong number."
fi
Save the script in a file (e.g., armstrong_script.sh) and make it executable using the following command:

bash
Copy code
chmod +x armstrong_script.sh
Then, you can run the script and enter a number to check if it is an Armstrong number:

bash
Copy code
./armstrong_script.sh
The script will prompt you to enter a number and then check if it is an Armstrong number or not, without any validation.

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About Bash

Bash (Bourne Again Shell) is a shell program written by Brian Fox and is an upgraded version of Bourne Shell program 'sh'.

Features

  • Open source GNU project
  • Read and execute the commands from a Shell Script
  • Can be invoked by either single-character command line options (-a, -b, -c, -i, -l, -r, etc. ) or by multi-character command line options also like --help, --debugger,--login, etc.
  • Consists of Key bindings
  • Available in restricted mode for the environment security
  • Contains one-dimensional arrays to manipulate the lists of data.

Syntax help

Variables

name="Foo"
echo $name
echo "$name"
echo "${name}"

Conditional Statements

If

if [ conditional-expression ]  
then  
statements  
fi

If-else

if [ conditional-expression ]  
then  
   statements  
else  
  statements
fi

Else-If

if [ conditional-expression ]  
then  
   statements  
elif [ conditional-expression ]  
then  
 statements  
else  
  statements
fi