hex2dec

#!/bin/bash
# hex to decimal number converter
# mutante (s23.org) 11/2006

if [ ! -n "$1" ]
then
read -p "Give me a hex number: " hex
else
hex=$1
fi

length=${#hex}
        i=0
        result=0
        let length--
        pos=0
        while [ $length -ge 0 ];
        do
        digit=${hex:$length:1}
        case "$digit" in
        A | a) ddigit=10;;
        B | b) ddigit=11;;
        C | c) ddigit=12;;
        D | d) ddigit=13;;
        E | e) ddigit=14;;
        F | f) ddigit=15;;
        [0-9]) ddigit=$digit;;
        *) echo "Bad input. Only 0-9 and A-F are allowed."; exit 1;;
        esac
        factor=`echo "(16^$pos)" | bc`
        subresult=`echo "$factor*$ddigit" | bc`
        if [ ! -n "$1" ]; then echo "[$pos]: $digit => $ddigit * (16^$pos) = $ddigit * $factor = $subresult +" | boxes -d ada-cmt; fi
        let result=$result+$subresult
        let pos++
        let length--
        done

        if [ ! -n "$1" ]; then echo "Result: $hex (hex) is $result (dec)" | boxes -d ada-box; else echo "$hex (hex) = $result (dec)"; fi
        exit 0

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