The document contains the code for several Bash shell programs that perform tasks like calculating factorials, checking for palindromes, generating Fibonacci sequences, reversing strings, comparing numbers and strings, and determining if a year is a leap year. Each program section includes the code, an output header, and sample run outputs showing the program working as expected for different inputs.

1. FACTORIAL
PROGRAM:
clear
echo Factorial
echo Enter the No..
read n
i=1
f=1
while [ $i -le $n ]
do
f=$((f*i))
i=$((i+1))
done
echo Factorial of $n is $f
OUTPUT:

2. Factorial
Enter the No..
5
Factorial of 5 is 120

3. PALINDROME
PROGRAM:
clear
echo Enter the String
read s
echo $s > temp
rs="$(rev temp)"
if [ $s = $rs ]
then
echo It is Palindrome
else
echo It is not Palindrome
fi

4. OUTPUT:
Enter the String
MADAM
It is Palindrome

5. FIBONACCI
PROGRAM:
clear
echo Fibonacci Series
echo Enter the No.
read n
f1=-1
f2=1
echo The Fibonacci Series Is
while [ $n -ge 1 ]
do
f3=$(($f1+$f2))
echo $f3
f1=$f2
f2=$f3
n=$(($n-1))
done

6. OUTPUT:
Enter the No.
10
The Fibonacci Series Is
0
1
1
2
3
5
8
13
21
34

7. REVERSE STRING
PROGRAM:
echo Enter the String
read s
echo $s > temp
rs="$(rev temp)"
echo The Reverse String is $rs

8. OUTPUT:
Enter the String
BORISE
The Reverse String is ESIROB

9. GREATER OF THE THREE NUMBERS
PROGRAM:
echo "Enter The No.1:"
read a
echo "Enter the No.2:"
read b
echo "enter the NO.3:"
read c
if [ $a -gt $b ]
then
if [ $a -gt $c ]
then
echo "No1 is Greater"
fi
elif [ $b -gt $c ]
then
echo "No2 is Greater"
else
echo "No3 is Greater"
fi

10. OUTPUT:
Enter The No.1: 20
Enter the No.2: 34
enter the NO.3: 23
No2 is Greater

11. LENGTH OF THE STRING
PROGRAM:
clear
echo Enter The String
read s
t=${#s}
echo The Length Of the String is $t

12. OUTPUT:
Enter The String
Operating System
The Length Of the String is 16

13. LOWER TO UPPER
PROGRAM:
clear
echo Enter The String
read s
t=$(expr $s |tr [a-z] [A-Z])
echo The Upper Case Of $s Is $t

14. OUTPUT:
Enter The String
system
The Upper Case Of system Is SYSTEM

15. UPPER TO LOWER
PROGRAM:
clear
echo Enter The String
read s
t=$(expr $s |tr [A-Z] [a-z] )
echo The Upper Case Of $s Is $t

16. OUTPUT:
Enter The String
SYSTEM
The Lower Case Of SYSTEM Is system

17. PRIME OR NOT
PROGRAM:
clear
echo Enter the No..
read n
c=0
i=2
t=$(($n-1))
while [ $i -le $t ]
do
q=$(($n%$i))
if [ $q -eq 0 ]
then
c=$(($c+1))
fi
i=$(($i+1))
done
if [ $c -eq 0 ]
then
echo It is Prime
else
echo It is Not Prime
fi

18. OUTPUT:
Enter the No..
7
It is Prime
Enter the No..
8
It is Not Prime

19. POSITVE NEGATIVE & ZERO
PROGRAM:
echo Enter The No.
read n
if [ $n -gt 0 ]
then
echo $n is Positive
elif [ $n -lt 0 ]
then
echo $n is Negative
else
echo $n is Zero
fi

20. OUTPUT:
Enter The No.
5
5 is Positive
Enter The No.
-4
-4 is Negative
Enter The No.
0
0 is Zero

21. ODD / EVEN
PROGRAM:
clear
echo "Odd/Even"
echo "Enter the No.:"
read n
s=$(($n%2))
if [ $s -eq 0 ]
then
echo "$n is Even"
else
echo "$n is Odd"
fi

22. OUTPUT:
Odd/Even
Enter the No.:
4
4 is Even
Enter the No.:
5
5 is Odd

23. COMPARING THE STRING
PROGRAM:
clear
echo Enter The 1st String::
read s1
echo Enter The 2nd String::
read s2
if [ $s1 = $s2 ]
then
echo Strings Are Equal
else
echo Strings Are Not Equal
fi

24. OUTPUT:
Enter The 1st String::
System
Enter The 2nd String::
System
Strings Are Equal

25. LEAP YEAR
PROGRAM:
clear
echo "Leap Year"
echo "Enter the Year.:"
read n
s=$(($n%4))
if [ $s -eq 0 ]
then
echo "$n is Leap year"
else
echo "$n is Not Leap Year"
fi

26. OUTPUT:
Leap Year
Enter the Year.:
1990
1990 is Not Leap Year
Enter the Year.:
1992
1992 is Leap year