**AIM:**

To write a shell program for the following:

(i) Sum of series.

(ii) Factorial of a number.

**ALGORITHM:**

Sum of series:

· Get the range of series

· intialise the sum to zero and increment the variable.

· Check whether increment value is less than equal to range.

· if so calculate the sum and value.

· Display the result.

· Terminate the program.

Factorial of a number:

· Get the number to find factorial.

· Initialize the variable and find the factorial.

· Check whether the value is lesser than zero.

· if true calculate factorial.

**PROGRAM SOURCE CODE**

(i) Sum of digits:

echo ”enter the range”

read range

s=0

i=1

while [ $i – le $range ]

do

s= `expr $s + $i `

i=`expr $i + 1`

done

echo “the sum is : $s”

(ii) Factorial of a number:

echo “enter the number”

Read n

i=1

j=1

while [ $i –le $n ]

do

j=`expr $i \* $j`

i=`expr $i + 1`

done

echo “factorial : $j”

**CONCLUSION:**

Thus the shell program to find the sum of series and factorial computation are written and executed successfully.