Question 2:  Write shell program for the following

a)      To remove from an ordered array all numbers that occurs more than  once.

b)      To check whether a string is palindrome or not.

c)      To sort the given list of numbers using bubble sort.

Ans :

# Shell Programs to Remove duplicate members of a sorted/ordered array

echo “Enter Total Numbers in the Array”

read tot

i=1

while [ $i  –le $tot ]

do

echo “Enter the Sorted ordered array number - $i”

read num$i

i=`expr $i + 1`

done

i=1

y=${num$i}

echo $y

i=2

flag=0

while [ $i  –le $tot ]

do

z=${num$i}

if [ $y –ne $z ]

then

flag=`expr $flag + 1`

sort$flag=$z

y=$z

fi

i= 'expr $i + 1`

done

i=1

echo “Unique set of numbers”

while [ $i –le $flag ]

do

echo ${sort$i}

i=`expr $i + 1`

done

Shell Program for strings for Checking of Palindrome

# Shell Program for strings for Checking of Palindrome

echo “Enter a String to check for Palindrome “

read str

i=1

y=`expr  $str  |  wc  –c`

y=`expr  $y  –  1’

z=$y

echo “The Length of String $str = $y”

while  [ $y  –ne  0 ]

do

z=`expr  $str  |  cut  –c $i`

w=`expr $str | cut –c $y`

if [“$z” != “$w”]

then

echo “ The Given String  $str is not Palindrome”

y=0

else

i=`expr $i + 1’

y=`expr $y - 1`

fi

done

if [ “$z” ==”$w”]

then

echo “The Given String  $str is a Palindrome”

fi

Shell Programming – Bubble Sort

#  Shell Programming – Bubble Sort

echo “Enter Total Numbers to be sorted ”

read tot

i=1

while [ $i  – le  $tot ]

do

echo “Enter the Number $i   =  ”

read  nm$i

i=`expr $i  +  1`

done

m=1

while [ $m  –le  $tot ]

do

n= `expr  $m  +  i`

while [  $n  –le  $tot  ]

do

if  [  ${nm$m}  –gt  ${nm$n} ]

then

a=${nm$m}

nm$m=${nm$n}

nm$n=$a

fi

n=`expr $n + 1`

done

m=`expr $m + 1`

done

echo “ Listing of Sorted Array “

k=1

while [ $k  –le  $tot ]

do

echo "The sorted number $k is ${nm$k}"

k=`expr  $k  +  1`

done