Shell script to find factorial of a number using recursion
A shell script is a computer program designed to be run by the Unix shell, a command line interpreter. This blog is about a shell scripting program to find the factorial of a number using recursion. Logic The logic is simple. If the number ' n ' is 1, return 1. Else return ' n ' * ' factorial(n-1) '. Program #!/bin/sh factorial() { if [ "$1" -gt "1" ]; then a=`expr $1 - 1` b=`factorial $a` c=`expr $1 \* $b` echo $c else echo 1 fi } echo "Enter a number:" read x factorial $x Things to note: - After writing the script, change the mod of the script to enable execution. This is done by: chmod +x factorial.sh or chmod 755 factorial.sh Output of the program Enter a number: 4 24 Good to read 1) Java program to convert mobile number pad to characters 2) Difference between "diff" and "sdiff" command 3) Java program to return first non repeated character in a string