variables and $eth0_address

[TobyR]

From reading HOWTO docs (and in particular Snort configutaion info) it seems to me there should be variables called $eth0_address, $eth1_address etc. However, if I run a straight ...
echo $eth0_address
... then I get a null response, plus if I try to ise it in context it doesn't work. I know 'env' and 'printenv' give a list of all the environment variables, but is there a way to list other variables (such as this '$eth0_address')?

Any ideas? I'm running RH7.3, kernel 2.4.20.

Thanks
Toby

[TobyR]

Mmm, just realised this went into the wrong forum to post this in - if any moderator can/wants to put this in a more appropriate forum then I'd be grateful.

Thanks

[mdwatts]

Moved to the Networking forum. $5 please :)

I would imagine not ALL distros would use those variables. SuSE doesn't.

Are you just looking for the assigned ip address for eth0?

ifconfig eth0

[TobyR]

Canadian, US or other? ;-)

I'm probaly showing my ignorance here, but from the IP addres shown in 'ifconfig eth0' how can I then refer to the IP address as a variable in a script?

Thanks in advance.

[bwkaz]

/sbin/ifconfig eth0 | grep inet | cut -d: -f2 | cut -d' ' -f1 (that is, ifconfig eth0, search for the string "inet" and print out only that line, then break that line apart using : as a separator, and print only the second field, then break that field apart using space as a separator and print only the first field) will print out just the IP address. Now to get that into a variable, you put it in between $( and ), like so:

youripaddress=$(/sbin/ifconfig eth0 | grep inet | cut -d: -f2 | cut -d' ' -f1) If you're not using bash, then you'll probably have to replace $( and ) with backticks (the unshifted tilde key on a US keyboard), but $( and ) will work if you're using bash (they also nest more easily).

[TobyR]

Many thanks

Toby