2.shell script to check whether the given number is odd or even and whether it is positive, negative or zero

echo "Check the number if its EVEN/ODD/POSITIVE/NEGATIVE/ZERO"

echo "*******************************************************"

echo "enter a number"

read num

case $num in

   *[a-z]*)echo "Invalid input"

                        echo "Error!!!"

      exit

      ;;

   *)break

      ;;

esac

op=1

while [ $op -eq 1 ]

do

echo "-----------------------------------------------------------"

echo " 1. POSITIVE/NEGATIVE"

echo " 2. EVEN/ODD"

echo " 3. Zero"

echo "Choose the option you would like to check for your number"

read ch

case $ch in

1)         if [ $num -gt 0 ]

            then

                        echo " The number you have typed is a Positive Number"

            else

                        echo " The number you have typed is a Negative Number"

            fi

            ;;         

2)         if [ `expr $num % 2` -eq 0 ]

            then

                        echo " The number you have typed is an Even number"

            else

                        echo "The number you have typed is an Odd number"

            fi

            ;;

3)         if [  $num -eq 0 ]

            then

                        echo " The number you have typed is a ZERO!"

            else

                        echo "The number you have typed is not Zero!"

            fi

            ;;

*) break

esac

echo "Would you like to check for another option? y=1/n=0"

read op

done

1.shell script to print prime numbers up to a given range using arguments

echo " PRIME NUMBERS"

echo " **************" 

if [ $# -gt 2 -o $# -eq 0 ]

then

    echo -n "Enter 2 input to test: "

    read num1 num2

else

    num1=$1

    num2=$2

fi

case $num1 in

   *[!0-9]*)echo "Invalid input "

                                echo " ERROR!!"

      exit

      ;;

   *)break

      ;;

esac

case $num2 in

   *[!0-9]*)echo "Invalid input "

                                echo " ERROR!!"

      exit

      ;;

   *)break

      ;;

esac

echo " The Prime Numbers between $num1 to $num2  ARe:"

while [ $num1 -le $num2 ]

do

   i=2

   while [ $i -lt $num1 ]

   do

      if [ `expr $num1 % $i` -eq 0 ]

      then

         break

      fi

      i=`expr $i + 1`

   done

               

   if [ `expr $num1 / $i` -eq 1 ]

   then

      echo "$num1"

   fi

   num1=`expr $num1 + 1`

done