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codecaine · (This post was last modified: 01-11-2010 02:43 PM by codecaine.)

I attached my source in a zip

Code:

#!/bin/bash

usage()

{

    #echos program name which is $0 and then a binary number

    echo "Usage: $0 10101"

}

#Is a function to the search if a string has nothing but 1 & 0's. Returns 0 for true and 1 if false

isBinary()

{

    #by default bash varaibles are gobal if you declare a varible with local is then it becomes local

    local binaryStr=`echo "$1" | sed -n '/^[0-1]*$/p'` 

    if [ -z $binaryStr ]

    then

        return 1

    else

        return 0

    fi

}

#check if binary

isBinary $1

if [ $# -gt 0 ]

then

    #check if the user entered a binary number

    if  isBinary $1 

    then

        #specail varible for math operations $((expression in here)) 2# is for base you could do echo $((3*3)) will show 9

        echo "$((2#$1))"

    else

        echo "invalid binary number enter"

        usage

        exit 1

    fi

else

    usage

fi