How can I write a Linux bash script that tells me which computers are ON in my LAN?

Question

How can I write a Linux Bash script that tells me which computers are ON in my LAN?

It would help if I could give it a range of IP addresses as input.

Answer 1

There is also fping:

fping -g 192.168.1.0/24

or:

fping -g 192.168.1.0 192.168.1.255

or show only hosts that are alive:

fping -ag 192.168.1.0/24

It pings hosts in parallel so the scan is very fast. I don't know a distribution which includes fping in its default installation but in most distributions you can get it through the package manager.