Find the config file of a network interface

helptonewbie · 11-07-2007, 04:06 PM

Hello,
I'm trying to find out two things here, if there is an easy way to find out the network configuration file that the network interface has been assigned to eg:

1. My linux machine has ifcfg-eth0 but if you had more interfaces this file might be ifcfg-eth1, or ifcfg-foobar.
Anyway the point is the IP address could be on any type of network interface therefore i can't hard code into my script which file the ip address is configured in because it will change depending on the interface being used for the connection, and as this is a script i want it to be able to find out itself. Is there a way to do this??

2. One idea i came up with is to search all the network interface config files and then get it to return the file with the ip address settings in it, i could do this with grep but wonder how you can get grep if possible to search for more than one argument at a time i.e

grep -R if '192' && '255' && '543'

so i'm saying if a file contains '192' '255 '543' anywhere in its contents then as grep does, print out the path to that file. I just dont know if its possible to get grep to search many strings in a file all at the same time??

So if there is an answer to number 1. i'm very interested, but as a compromise and answer as to if grep with several strings for arguments is possible would be great and probably do the job to?

Thanks and Regards

chrism01 · 11-07-2007, 07:10 PM

something along these lines ?

Code:

cd <dir with ifcfg files>
for file in `ifcfg-*`
do
    grep $ip $file >/dev/null 2>&1
    if[[ $? -eq 0 ]]
    then
        echo "file is $file"
    fi
done

helptonewbie · 11-08-2007, 03:36 AM

Yeah like that, but i basically just want to know if you can get grep to match more than one text string within a file, but i dont know if it is able to match more than one set of strings in a file.
So if file contains 'the' and 'help' and 'blah' and 'foobar' then that is the correct file and print the file's path to stdout including the file name.

Cheers

ps- to be honest i doubt you'd need the for look as grep can look in all the files and print output of which file anyway, so all i really need is to know if you can grep for several things at once and how?

bigearsbilly · 11-08-2007, 04:03 AM

well, if you play with your network settings it's usually done in the
rc.local file

as for searching for multiple strings,
easiest is,

grep -l THIS *.file | xargs grep -l THAT | xargs grep -l THE_OTHER

Code:

files with stdio.h
billym.>grep -l  stdio.h *|cat -n                
     1  dtb_utils.c
     2  robots.c
     3  robots_stubs.c

files with stdio.h and sprintf
billym.primadtpdev>grep -l  stdio.h *| xargs grep -l sprintf | cat -n
     1  dtb_utils.c
     2  robots_stubs.c

helptonewbie · 11-08-2007, 04:51 AM

thanks it works perfect,

grep -lR 'foo' /blah/foobar | xargs grep -lR 'blah'

cheers!!!