Write a shell script to find greatest of three. Script must consider the case where two numbers are equal.

. read a;

read b;

read c;

if [ $a -gt $b -a $a -gt $c ]

then

echo $a is greater;

elif [ $b -gt $c -a $b -gt $a ]

then

echo $b is greater;

elif [ $c -gt $a -a $c -gt $b ]

then

echo $c is greater;

elif [ $a = $b -a $a -gt $c ]

then

echo $a and $b are greater;

elif [ $b = $c -a $b -gt $a ]

then

echo $b and $c are greater;

elif [ $c = $a -a $c -gt $b ]

then

echo $c and $a are greater;

else

echo all are equal;

fi