#!/bin/bash

# Function to check if a number is prime
is_prime() {
    local num=$1

    # 0 and 1 are not prime numbers
    if [ $num -lt 2 ]; then
        return 1
    fi

    # Loop to check divisibility by numbers up to the square root of the number
    for (( i = 2; i * i <= num; i++ )); do
        if [ $((num % i)) -eq 0 ]; then
            return 1
        fi
    done

    return 0
}

# Check if the script is executed with an argument
if [ $# -eq 0 ]; then
    echo "Usage: ./prime_check.sh <number>"
    exit 1
fi

# Check if the input is a non-negative integer
if ! [[ $1 =~ ^[0-9]+$ ]]; then
    echo "Error: Please enter a non-negative integer."
    exit 1
fi

# Call the function to check if the number is prime
is_prime $1
if [ $? -eq 0 ]; then
    echo "$1 is a prime number."
else
    echo "$1 is not a prime number."
fi
./prime_check.sh 3

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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