Today many hosts are blocking traditional ICMP echo replay for an "security" reason, so nmap's fast ARP scan is more usable to view all live IPv4 devices around you. Must be root for ARP scanning.
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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nmap -sP your network/submask | awk "/^Host/"'{ print $2 }'
#Host aveil (192.168.0.144) appears to be up.
and so you would print out the machine name, not the network. Machines that don't have names, will then cause both ips and names to print out, which would look odd.lan|grep Host |grep -oE '[0-9]+\.[0-9\.]+'
will filter out only IP addresses from such networks.