Re: netmask in a script

>> ===================== begin =======================
>> to_int()
>> {
>>     # Convert from dotted-quad to integer
>>     local i=$1
>>     local OIFS="$IFS"
>>     IFS=.
>>     i=($i)
>>     IFS="$OIFS"
>>     echo $(((${i[0]}<<  24) + (${i[1]}<<  16) + (${i[2]}<<  8) +
>> ${i[3]}))
>> }

>> to_ip()
>> {
>>     # Covert from integer to dotted-quad
>>     local d=$1
>>     echo $(($d>>  24)).$(($d>>  16&  255)).$(($d>>  8&  255)).$(($d&255))
>> }

>> and_ip()
>> {
>>     # And two ip addresses in dotted-quad format
>>     local ip1=$1
>>     local ip2=$2
>>     echo $(to_ip $(($(to_int $ip1)&  $(to_int $ip2))))
>> }
>> ===================== end =======================