Decimal to Binary Conversion Shell Script

#!/bin/bash
# SCRIPT:  dec2binary.sh
# USAGE:   dec2binary.sh Decimal_Number(s)
# PURPOSE: Decimal to Binary Conversion. Takes input as command line
#          arguments.
#                        \\\\ ////
#                       \\  - -  //
#                           @ @
#                   ---oOOo-( )-oOOo---
#
#####################################################################
#                      Script Starts Here                           #
#####################################################################

if [ $# -eq 0 ]
then
    echo "Argument(s) not supplied "
    echo "Usage: dec2binary.sh Decimal_number(s)"
else
echo -e "\033[1mDECIMAL             \t\t BINARY\033[0m"

    while [ $# -ne 0 ]
    do
         DecNum=$1
         Binary=
         Number=$DecNum

         while [ $DecNum -ne 0 ]
         do
              Bit=$(expr $DecNum % 2)
              Binary=$Bit$Binary
              DecNum=$(expr $DecNum / 2)
         done

         echo -e "$Number              \t\t $Binary"
         shift
# Shifts command line arguments one step.Now $1 holds second argument
        unset Binary
   done

fi

#NOTE: Using bc command you can directly get output at command line.
#   $ echo 'obase=2;15' | bc
#     1111
#   $ echo 'obase=2;1023' | bc
#     1111111111
#   $ echo 'obase=2;1024' | bc
#     10000000000
# No need of ibase=10, because default ibase is 10. 
OUTPUT:
# sh dec2binary.sh 7 16 255 256 1023 1024
DECIMAL                          BINARY
7                                111
16                               10000
255                              11111111
256                              100000000
1023                             1111111111
1024                             10000000000

# sh dec2binary.sh 9223372036854775807
DECIMAL                          BINARY
9223372036854775807              1111111111111111111111111111111111111
11111111111111111111111111

#sh dec2binary.sh 9223372036854775808
DECIMAL                          BINARY
dec2binary.sh:line 13:[:9223372036854775808:integer expression expected
9223372036854775808

NOTE:My bash can handle upto 9223372036854775807.
But with bc command you can do more.
# echo 'obase=2;9223372036854775808'|bc
1000000000000000000000000000000000000000000000000000000000000000