On Wed 26 Apr 2017 at 13:50:15 (+0100), Darac Marjal wrote: > On Wed, Apr 26, 2017 at 08:35:44AM -0400, Greg Wooledge wrote: > >On Wed, Apr 26, 2017 at 01:25:18PM +0100, Darac Marjal wrote: > >>For interface statistics from ip, try "ip -s link [interface]". > > > >On stretch: > > > >wooledg:~$ ip -s link eth0 > >Command "eth0" is unknown, try "ip link help". > > > >wooledg:~$ ip -s link dev eth0 > >Command "dev" is unknown, try "ip link help". > > > >wooledg:~$ ip link help > >[... enormous BNF dump, entirely missing -s, or any reference whatsoever > > to the fact that you can stick options between "ip" and "link" ...]
Presumably you realisd that the options to ip are documented in man ip and summarised in ip help. Otherwise, this has to be duplicated and maintained seventeen times. > >wooledg:~$ ip -s link show eth0 > >2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state > >UP mode DEFAULT group default qlen 1000 > > link/ether a0:8c:fd:c3:89:e0 brd ff:ff:ff:ff:ff:ff > > RX: bytes packets errors dropped overrun mcast > > 380719013 1442490 0 0 0 4731 > > TX: bytes packets errors dropped carrier collsns > > 57971257 614586 0 0 0 0 > > > >Aha! > > My bad. I actually only got as far as discovering "ip -s link" on my own > system. As I was typing up the email I remembered that Richard was after > statistics for a specific interface. I should have been more diligent in > working out the correct format. > > > > >(Sadly, this is my *typical* experience with the ip command -- trying > >random things until one of them works, because the documentation > >is impenetrable, and the syntax barely guessable, and certainly not > >predictable.) > > ip *could* do a lot better, it's true. As a monolithic tool, there's not > really much excuse for the different sub-tools to parse the commands > differently. As you say, "ip address" expects the device to be expressed > as "dev eth0", so why doesn't "ip link" handle it the same way? I don't > know. They do. Both expect a command. You can "show" something but you can't "dev" it or, at least, I don't know how to. Cheers, David.