How to check internet connection?

Shell Programming and Scripting
1

Hello,
I need a simple shell script that returns a value if the system is internet connected and a different value if the system is not connected.

Can anyone please help?
Thanks
Daniele

2 
ping -c1 unix.com &>/dev/null && echo "online" || echo "offline"
online
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3

Thanks

4

I wouldn't do just one ping ( -c1 ). It is quite normal for the first ping to fail if there's not ARP table entry, and it would not be an indication that the node has lost network connectivity.

-c 3 or perhaps even -c 5 I would consider a more reliable metric.

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