十进制和十六进制转换的Shell脚本

#!/bin/bash

[ $# -eq 0 ] && exit 1
prefix=`echo $1 | cut -c 1-2`

if [ $prefix = "0x" ]
then
        i1=`printf %d $1`
        i2=`expr $i1 \/ 1024`
        i3=`expr $i1 \/ 1024 \/ 1024`
        printf $1=%d=%dK=%dM'\n' $i1 $i2 $i3
        exit 0
fi

if [ $prefix != "0x" ]
then
        printf $1=0x%x'\n' $1
        exit 0
fi