GTU OS Program - 4

4. Write a shell script to find factorial of given number n.

As we have done this program many times in our programming career the logic will be same but there will be some changes in syntax.

Start by creating a new file called factorial.sh using vim

tkanu025@hp:~/lab_solutions$ vim factorial.sh

Complete code of the program

  1. fact=1
  2. read -p "Enter a number to find its factorial : " n
  3.  
  4. #if entered value is less than 0
  5. if [ $n -le 0 ]
  6. then
  7.         echo "invalid number"
  8.         exit
  9. fi
  10. #logic for finding factorial
  11. a=$n
  12. while [ $a -ge 1 ]
  13. do
  14.         fact=`expr $fact \* $a`
  15.         a=`expr $a - 1`
  16. done
  17. echo "Factorial of $n is $fact"

Interpreting the factorial.sh file and executing it in terminal

  1. tkanu025@hp:~/lab_solutions$ chmod +x factorial.sh
  2. tkanu025@hp:~/lab_solutions$ ./factorial.sh
And here is the output
Gujarat Technological university OS programs

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os GTU Practical,

operating system Programs,

Operating system shellscript programs,

Gtu study material 3140705,

OS 3140702,

os practical list,

shell script programming,

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