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Groups > comp.os.linux.networking > #1220
| From | Bit Twister <BitTwister@mouse-potato.com> |
|---|---|
| Newsgroups | comp.os.linux.networking |
| Subject | Re: How to know if eth0 is up? |
| Date | 2012-03-30 19:57 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <slrnjnc41d.6pk.BitTwister@wb.home.test> (permalink) |
| References | <4f75f0eb$0$19106$426a34cc@news.free.fr> |
On 30 Mar 2012 17:44:11 GMT, <fab@slick.airforce-one.org> wrote: > Hello. Hi. You know if you were to read http://www.catb.org/~esr/faqs/smart-questions.html it suggest giving meaningful information pertinent to your setup. At a minimum I would suggest which linux distribution, release, and Ethernet card. That kind of information might get you some exact answers. NIC may dictate which tool (ethtool, or mii-tool). Distribution might get you what net function can be used to make you code much more maintainable as time goes by. > I'd like to know if there is a command line instruction or a /proc/ > entry that tells reliably if a cable is hooked in an ethernet port > (typically, to know at boot if I must use my dhcp client on eth0, or > look for a WIFI cell). > > I have found /proc/net/dev but it shows eth0 even though no cable is > plugged in. On my distribution, carrier status is found over in /sys/class/net and the network-functions script has a check_link_down function to do all the dirty work. Based on the lack of any detailed information, I can only suggest trying something like parsing the output from something like LC_ALL=C ip link show dev eth0
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How to know if eth0 is up? <fab@slick.airforce-one.org> - 2012-03-30 17:44 +0000
Re: How to know if eth0 is up? Chris Davies <chris-usenet@roaima.co.uk> - 2012-03-30 19:33 +0100
Re: How to know if eth0 is up? Bit Twister <BitTwister@mouse-potato.com> - 2012-03-30 19:57 +0000
Re: How to know if eth0 is up? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-31 21:22 +0000
Re: How to know if eth0 is up? J G Miller <miller@yoyo.ORG> - 2012-03-30 21:12 +0000
Re: How to know if eth0 is up? Mark Evans <mpe@anacon.freeserve.co.uk> - 2012-04-05 19:07 +0100
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