sed or awk

ilo · 08-22-2008, 10:00 AM

Hello All, I am trying to program a script to change the ip.

I would like that the user enters 67.50.25.25
and since we use /24 masks I can just "calculate" from sed or awk

the gateway 67.50.25.1 the network 67.50.25.0 and the broadcast 67.50.25.255.

Any help would be appreciated.

matthewg42 · 08-22-2008, 10:38 AM

You can do this quite easily with a shell script and internal string manipulation - no need to invoke other processes:

Code:

#!/bin/bash

read -p "enter the IP> " ip
slash24root="${ip%.*}"
gateway="$slash24root.1"
network="$slash24root.0"
broadcast="$slash24root.255"

printf "%-20s = %s\n" "ip" "$ip"
printf "%-20s = %s\n" "gateway" "$gateway"
printf "%-20s = %s\n" "network" "$network"
printf "%-20s = %s\n" "broadcast" "$broadcast"