On Feb 16 2007 16:15, Sylvester Lykkehus wrote:

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I could fiddle with `hwinfo --network` or try parse `ip l sh dev br0` output, but what's actually best? [Using sh.]

How about this?

% cat /sys/class/net/eth?/address

Wonderul, many thanks.

Or the long version: /sbin/ifconfig [interface] | grep HWaddr | tail --bytes=20 | head --bytes=17 ^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

That is what I wanted to avoid because it will totally break when the locale changes.

This will work on other dists aswell, where as /sys/class/net/eth?/address does not exists on e.g. debian iirc.

Did you really need to mention the worst example! (Anyway, even debian 3.1r4/2.6.8 has that sysfs file.) Jan -- ft: http://freshmeat.net/p/chaostables/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

Hi, On Feb 16 2007 21:16, Sylvester Lykkehus wrote:

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Or the long version: /sbin/ifconfig [interface] | grep HWaddr | tail --bytes=20 | head --bytes=17

That is what I wanted to avoid because it will totally break when the locale changes.

How could a locale change break a grep for HWaddr ? No really, could you give an example, I never did use another locale than EN. Even if it would, couldn't you export the environment variable first ?

21:39 ichi:~ > ifconfig lo lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:838 errors:0 dropped:0 overruns:0 frame:0 TX packets:838 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:108107 (105.5 Kb) TX bytes:108107 (105.5 Kb) 21:39 ichi:~ > LC_MESSAGES=de_DE ifconfig lo lo Protokoll:Lokale Schleife inet Adresse:127.0.0.1 Maske:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:838 errors:0 dropped:0 overruns:0 frame:0 TX packets:838 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 Sendewarteschlangenlänge:0 RX bytes:108107 (105.5 Kb) TX bytes:108107 (105.5 Kb) As you can see: inet addr:127.0.0.1 Mask:255.0.0.0 inet Adresse:127.0.0.1 Maske:255.0.0.0 and whoops, things like /bin/cut -b or head/tail --bytes are not accurate anymore. Jan -- ft: http://freshmeat.net/p/chaostables/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

On Feb 16 2007 23:04, Sylvester Lykkehus wrote:

Jan Engelhardt wrote:

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Hi, 21:39 ichi:~ > ifconfig lo lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 [...]

You could have shown an interface which actually has a hardware address ;-)

ifconfig is broken. Heck, it does not even display secondary addresses that don't have labels. Don't use it. # ip l sh lo 1: lo: mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 # cat /sys/class/net/lo/address 00:00:00:00:00:00 # cat /sys/class/net/dsl0/address (no result) # cat /sys/class/net/tun0/address (no result) Result: lo *does* have a MAC address. Jan -- ft: http://freshmeat.net/p/chaostables/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org

On Friday 16 February 2007 12:40, Jan Engelhardt wrote:

Hi,

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How could a locale change break a grep for HWaddr ? ...

21:39 ichi:~ > ifconfig lo lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 ...

21:39 ichi:~ > LC_MESSAGES=de_DE ifconfig lo lo Protokoll:Lokale Schleife inet Adresse:127.0.0.1 Maske:255.0.0.0 ...

As you can see:

inet addr:127.0.0.1 Mask:255.0.0.0 inet Adresse:127.0.0.1 Maske:255.0.0.0

and whoops, things like /bin/cut -b or head/tail --bytes are not accurate anymore.

Then perhaps you could fix the locale in the invocation you want to use to extract the MAC address (just as you did to generate this example). Though personally, I think using the system's introspection files (e.g., /sys/class/net/eth?/address), while not portable outside Linux, is a lot cleaner than scraping information from the output of commands that is intended to be read by humans.

Jan

Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org