Shell Programming and Scripting

#!/bin/sh

get_from_A_to_F() 
{   
    case $1 in
        10)  $1="A"
        ;;
        11)  $1="B"
        ;;
        12)  $1="C"
        ;;
        13)  $1="D"
        ;;
        14)  $1="E"
        ;;
        15)  $1="F"    
        ;; 
        [0-9]) $1=$1
        ;;  
    esac
    echo $1
}

read number
string=""
index=`expr index $number "."`
if [ $index -eq 0 ]
then
    integer=$number
    fraction=0
else
    integer=`expr substr $number 1 $(expr $index - 1)`
    fraction=`expr "$number - $integer" | bc`
fi
result=$integer
while [ $result -ne 0 ] 
do
    remainder=`expr $result % 16`
    get_from_A_to_F $remainder
    result=`expr $result / 16`
    string=$remainder$string
    #echo $string
done

get_from_A_to_F "$remainder"

echo "ibase=10;obase=16;$remainder" | bc

typeset remainder

case $remainder

./testme.sh
634
A
10
7
7
2
2

$ remainder=634
$ echo "ibase=10;obase=16;$remainder" | bc
27A