#!/bin/bash
# Recursive factorial function

factorial()
{
    product=$1
           
    # Defining a function to calculate factorial using recursion
    if((product <= 2)); then
        echo $product
    else
        f=$((product -1))
        
# Recursive call

f=$(factorial $f)
f=$((f*product))
echo $f
fi
}

# main program
# reading the input from user
echo "Enter the number:"   
read num

# defining a special case for 0! = 1
if((num == 0)); then   
echo 1
else
#calling the function
factorial $num
fi
by

Online Bash Shell

Write, Run & Share Bash code online using OneCompiler's Online Bash Shell for free. It's one of the robust, feature-rich Bash shell available over online and getting started with the OneCompiler's Bash Shell is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Bash. OneCompiler also has reference scripts, where you can look for the sample scripts and start coding.

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