22 Feb
2017
22 Feb
'17
5:01 p.m.
On Wed, Feb 22, 2017 at 04:34:37PM +0000, Simon Ransome wrote:
Chris,
This does it in exactly one second, if that's any use:
ping -c1 n.n.n.n -w1
(just look for "100% packet loss" in the output).
You're probably looking at implementing something using an ICMP library to get any faster.
Excellent, thank you, what a nice simple solution. I use ping's exit value to decide whether the system is there on not.
By the way everyone I was just trying this out and realised that the delay I was originally finding annoying was 10 seconds rather than just 3. A one second delay is fine.
--
Chris Green