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List all the machine ip's currently running on your network
There are 5 alternatives - vote for the best!
Prevents the need for the grep & awk statements. Sort is optional if you don't care about the output order. The network range can also be specified as in the original post.
-A Display targets by address rather than DNS name. (Probably unnecessary...)
-a Show systems that are alive.
S fping -r1 -ag 192.168.nnn.0/24 2>/dev/null
If you can do better, submit your command here.
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