In this tutorial, you’ll learn what is a perfect number and also create Shell Script to check a number is perfect number or not.
What is a perfect number?
A number whose sum of factors (excluding the number itself) is equal to the number is called a perfect number. In other words, if the sum of positive divisors (excluding the number itself) of a number equals the number itself is called a perfect number.
For example: 6 is Perfect Number since divisor of 6 are 1, 2 and 3. Sum of its divisor is
1 + 2+ 3 =6
and 28 is also a Perfect Number
since 1+ 2 + 4 + 7 + 14= 28
Other perfect numbers: 496, 8128
Shell Script to check a number is perfect number or not
#!/bin/bash read -p "Enter a number " num sum=0 for ((i=1;i<num;i++)) do if((num%i==0)) then ((sum=sum+i)) fi done if((sum==num)) then echo "$num is a perfect number" else echo "$num is not a perfect number" fi
anupmaurya@linux:~$ ./perfectnumber.sh Enter a number 28 28 is a perfect number anupmaurya@linux:~$
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