Emergency UNIX and Linux Support

#!/bin/sh

INPUT () {
    echo "Please enter line number: "
    read LINE

    echo "Please enter column number that you want to modify: "
    read COLUMN

    head -$LINE dataf > line1;
    LINE=`expr $LINE + 1`
    head -$LINE dataf > line2;

    diff line1 line2 > tmp;
    sed -e 's/;/ /g' tmp > tmp2;
    COLUMN=`expr $COLUMN + 1`
    OLDV=`awk '{printf "%s\n",$'$COLUMN' ; }' tmp2`
    echo "The value is $OLDV \n"

    echo "Please enter new value of the column: "
    read NEWV
    sed 's/'`echo "$OLDV"`'/'`echo "$NEWV"`'/g' tmp2 > tmp3
    cat tmp3

}

OthersMod () {
    echo "Do you want to do other modifications [y/n]?"
    read ANS

while [ "$ANS" = y ] 
do

    INPUT
    OthersMod 

done
}


INPUT
OthersMod

sed  "s/${OLDV}/${NEWV}/g" tmp2 > tmp3

 eval sed 's/$OLDV/$NEWV/g' tmp2 > tmp3