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On 2013-03-23, at 10:40 PM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> Seems simple.  What's the best way (in a script) to get the IP address of 
> an ethernet interface (in linux).  For instance eth0.
> 
> I used to have (perl, but also applies as a bash solution):
> 
> $eip=`/sbin/ifconfig $int | grep 'inet addr' | awk '{print \$2}' | sed -e 's/.*://'`
> 
> But the latest upgrade from F16 to F17 broke this (now the line contains 
> "inet" but not "inet addr".
> 
> So I started thinking of finding the most standardized way that 
> (hopefully) won't change after a future kernel upgrade :-)
> 
> It would seem that the less field parsing done, the better, as keywords 
> and field position aren't guaranteed.
> 
> Looks like ifconfig is now deprecated (according to man ifconfig).  So now 
> I'm doing:
> 
> $eip=`ip -o -4 addr list eth0 | awk '{print \$4}'`
> 
> That works now, but it still has a output format-dependent requirements.
> 
> I looked for /sys or /dev files, but can't find any that have ip4 addr.  I 
> tried to find more options to whittle ip's output to give me just the 
> address, no joy there.
> 
> Ideas?
> 
> PS: this is important as failures like this force me to drive out onsite 
> to headless boxes, some of which are 200km away.
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