Well, you need to know when to stop reading lines otherwise you'll block (i.e. your program will just stop and wait for the other end to send data.) So, you either need to know exactly how many lines are going to be returned or look for a special pattern in the output.

If you really can't determine when the server has completed its response, you can guess based on the heuristic that if the server hasn't sent any data for X number of seconds and we're at the beginning of a line then just assume the server is done sending data.

In reply to Re^3: Net::Telnet: how to detect an empty line... by pc88mxer
in thread Net::Telnet: how to detect an empty line... by s2cuts

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