Get Network/Broadcast Address With Shell Script

Shell script for getting Network Address and Broadcast Address:

#!/bin/bash

all=(${@//[!0-9]/ })
[ "${#all[@]}" != "8" ] && {
echo "Usage: "
echo "${0##*/} ip.ip.ip.ip/mask.mask.mask.mask"
exit 1
}

get_addr () {
if [ "$1" = "-b" ]; then
op='|'; op1='^'; arg='255'
shift
else
op='&'
fi
unset address
while [ "$5" ]; do
num=$(( $1 $op ($5 $op1 $arg) ))
shift
address="$address.$num"
done
}

get_addr ${all[@]}
echo -e "network:\t${address#.}"
get_addr -b ${all[@]}
echo -e "broadcast:\t${address#.}"

Source:http://bbs2.chinaunix.net/viewthread.php?tid=196402&extra=page%3D1%26amp%3Bfilter%3Ddigest