TO STUDY COMMAND LINE ARGUMENTS

echo "TO STUDY COMMAND LINE ARGUMENTS"

        case $2 in
                +)      echo "Addition Operation"
                        x=$1
                        y=$3
                        echo "$x+$y=`expr $x + $y`" ;;

                -)      echo "Subtraction Operation"
                        x=$1
                        y=$3
                        echo "$x-$y=`expr $x - $y`" ;;

                \*)     echo "Multiplication Operation"
                        x=$1
                        y=$3
                        echo "$x*$y=`expr $x \* $y`" ;;

                /)      echo "Division Operation"
                        x=$1
                        y=$3
                        echo "$x/$y=`expr $x / $y`" ;;

        esac
#OUTPUT:
#chmod +x cmd.sh
#./cmd.sh 2 + 3
#Addition Operation
#2+3=5

PROGRAM TO DEMONSTRATE BACKGROUND PROCESSES

#PROGRAM TO DEMONSTRATE BACKGROUND PROCESSES

echo "background processes"
while :
do
ti=`date`
tput cup 0 65
echo -n $ti

sleep 1
clear
done

WAP to generate Fibonacci series

#WAP to generate Fibonacci series 

echo “Enter the range to be displayed” 
read n 
a=0
b=1
echo fibonacci series 
echo $a 
echo $b i=2 
while test $i -It $n 
do c = ‘expr $a + $b’ 
echo $c 
i=`expr$i+ 1’ 
a = $b 
b = $c 
done 

WAP to counts the number of lines and words present in a given file.

#WAP to counts the number of lines and words present in a given file.  

echo Enter a file name:
read n
echo Number of Lines:wc –l $n
echo Number of Words:wc –w $n
echo Number of Characters:wc –c $n

Largest of three numbers with the total and the average.

#WAP to find Largest of three numbers with the total and the average.

echo "Enter the 1st Number: "

read n1
echo "Enter the 2nd Number: "
read n2
echo "Enter the 3rd Number: "
read n3

total=`expr $n1 + $n2 + $n3`
avg=`expr $total / 3`
if [ $n1 -gt $n2 -a $n1 -gt $n3 ]
then
echo "$n1 is the Largest of three"
elif [ $n2 -gt $n1 -a $n2 -gt $n3 ]
then
echo "$n2 is the Largest of three"
elif [ $n3 -gt $n1 -a $n3 -gt $n2 ]
then
echo "$n3 is the Largest of three"
else
echo "All the three numbers are Equal"
fi
echo "Total: $total"
echo "Average: $avg"

To find a factorial of a given no.

 #To find a factorial of a given no.

fact=1
ie=1
echo -e "Enter a number:\c"
read a
while [ $ie -le $a ]
do
        fact=`expr $fact \* $ie`
        ie=`expr $ie + 1`
done
echo -e "Multilpication of $a number is $fact."
#OUTPUT
#Enter a number:5
#Multilpication of 10 number is 120.

Shell script to find the sum of the first n numbers.

#Write a shell script to find the sum of the first n numbers.

echo "Enter a number: "
read n
i=1
sum=0
while [ $i -le $n ]
do
sum=`expr $sum + $i`
i=`expr $i + 1`
done
echo "The sum of first $n numbers is: $sum"

#Enter a number:
#5
#The sum of first 5 numbers is: 15

PROGRAM TO FIND PRIME NOS IN SHELL SCRIPT

#PROGRAM TO FIND PRIME NOS IN SHELL SCRIPT
echo "Enter a number: "
read num
i=2
f=0
while [ $i -le `expr $num / 2` ]
do
if [ `expr $num % $i` -eq 0 ]
then
f=1
fi
i=`expr $i + 1`
done
if [ $f -eq 1 ]
then
echo "The number is composite"
else
echo "The number is Prime"
fi


#OUTPUT
#Enter a number:
#5
#The number is Prime

PROGRAM TO DISPLAY TABLE OF NUMBER

#PROGRAM TO DISPLAY TABLE OF NUMBER-WHILE LOOP

echo "enter no for which table is to be printed";
read x
i=1
while [ $i -lt 13 ]
do
echo " $x x $i = ` expr $x \* $i `"
i=`expr $i /* 1`;
done

---------------------------------------------------------------------------------------

# SAME PROGRAM USING FOR LOOP
echo enter number for table
read n
for (( i=1;i<=12;i++ ))
do
echo " $n x $i= `expr $n \* $i` ";
done
echo THANK U CODED BY TG

#OUTPUT:
#enter number for table
#10
#  10 x 1= 10
 #10 x 2= 20
 #10 x 3= 30
 #10 x 4= 40
 #10 x 5= 50
 #10 x 6= 60
 #10 x 7= 70
 #10 x 8= 80
 #10 x 9= 90
 #10 x 10= 100
 #10 x 11= 110
 #10 x 12= 120
#THANK U CODED BY TG#

PROGRAM TO DISPLAY SCREEN HANDLING

#PROGRAM TO DISPLAY SCREEN HANDLING

echo "enter text";
read text
for (( i=10 ;i>0;i++ ))
do
echo "enter ur choice"

echo -e "1>Bold \n 2>underline \n 3>strikethrough \n 4>text color \n 5>baground";
read choice

case $choice in
1)
echo "bold"
echo -e "\033[01m  $text"
echo -e "\033[00m  ";;
2)
echo "underline"
echo -e "\033[04m $text"
echo -e "\033[00m  ";;
3)
echo "strikethruh"
echo -e "\033[09m  $text"
echo -e "\033[00m  ";;
4)
echo "text color 35"
echo -e "\033[35m  $text"
echo -e "\033[00m  ";;
5)
echo "background color 44"
echo -e "\033[044m  $text"
echo -e "\033[00m ";;

esac
done

DISPLAY THE SUM AND REVERSE OF A NUMBER USING WHILE LOOP.

#DISPLAY THE SUM AND REVERSE OF A NUMBER USING WHILE LOOP.

echo "Enter the number: "
read x
rev=0
sum=0
d=0

while [ $x -gt 0 ]
do
 d=`expr $x % 10`
 x=`expr $x / 10`
 sum=`expr $sum + $d`
 rev=`expr $rev \* 10`
 rev=`expr $rev + $d`
done

echo "sum= " $sum
echo "reverse= " $rev

#OUTPUT:
#bash-3.00$ ./EXP7_1.sh
#Enter the number:
#123
#sum=  6
#reverse=  321

TO DEMONSTRATE NESTED IF ELSE USING SHELL SCRIPTING.

#TO DEMONSTRATE NESTED IF ELSE USING SHELL SCRIPTING.
echo "Enter percentage: "
read a

if [ $a -ge 75 ]
then
 echo "First Class Distinction"
elif [ $a -ge 60 ]
then
 echo "First Class"
elif [ $a -ge 40 ]
then
 echo "Second Class"
else
 echo "Fail"
fi


#OUTPUT:
#Enter percentage:
#75
#First Class Distinction

TO FIND IF NOS ARE EQUAL OR NOT USING SHELL SCRIPT

#TOPIC :TO FIND IF NOS ARE EQUAL OR NOT IN SHELL SCRIPT
echo "enter a:"
read a
echo "enter b:"
read b
if [ $a -eq $b ]
then
echo " numbers are not equal"
else
echo "nos are equal"
fi

TO PERFORM ARITHMETIC OPERATIONS USING SHELL SCRIPTING

#TO PERFORM ARITHMETIC OPERATIONS USING SHELL SCRIPTING IN LINUX

echo "Enter the number 1: "
read x
echo "Enter the number 2: "
read y

exit=0
while [ $exit -eq 0 ]
do

echo -e "\n1.Addition \n2.Subtraction \n3.Multiplication \n4.Division \n5.Mod \nEnter your choice:  "
read ch
case $ch in
 1)add=`expr $x + $y`
   echo "Addition= " $add;;
 2)sub=`expr $x - $y`
   echo "Subtraction= " $sub;;
 3)mul=`expr $x \* $y`
   echo "Multiplication= " $mul;;
 4)div=`expr $x / $y`
   echo "Division= " $div;;
 5)mod=`expr $x % $y`
   echo "Mod= " $mod;;
   esac

echo -e "\nDo you want to continue(0:'YES'/1:'NO'):  "
read exit

done