S Mathias wrote:
> perfect! thank you Oliver Grawert! :) made my day :) it's working! :
>
> ping -W 1 -c 4 google.com >& /dev/null && ping -W 1 -c 4 www.yahoo.com >& /dev/null || echo "no internet connection"
The ping documentation says:
-c count
Stop after sending count ECHO_REQUEST packets. With
deadline option, ping waits for count ECHO_REPLY
packets, until the timeout expires.
-w deadline
Specify a timeout, in seconds, before ping exits
regardless of how many packets have been sent or
received. In this case ping does not stop after count
packet are sent, it waits either for deadline expire or
until count probes are answered or for some error
notification from network.
[...]
If ping does not receive any reply packets at all it will exit
with code 1. If a packet count and deadline are both specified,
and fewer than count packets are received by the time the
deadline has arrived, it will also exit with code 1. On other
error it exits with code 2. Otherwise it exits with code
0. This makes it possible to use the exit code to see if a host
is alive or not.
Therefore I think the correct way to use the return code of ping is to
specify both -c and -w options. I don't think you need the -W option.
$ ping -c 4 -w 4 google.com &> /dev/null && ping -c 4 -w 4 www.yahoo.com &> /dev/null || echo "no internet connection"
Bob
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