[ale] Get host's IP address as an unprivileged user?

[Geoffrey Myers]

Richard Bronosky wrote:
> Thanks Geoffrey. A little piece of me dies every time I see some one
> pipe [almost] any combination of grep | sed | awk | tr | cut

Yeah, it's not a big deal much these days with the horsepower we have at 
our disposal, but when I was supporting a time reporting application on 
8 meg of memory, every process eliminated was a gain. ;)

> 
> On Mon, Jun 6, 2011 at 1:44 PM, Geoffrey Myers
> <lists at serioustechnology.com> wrote:
>> Derek Atkins wrote:
>>> JD <jdp at algoloma.com> writes:
>>>
>>>> On 06/03/2011 09:25 AM, James Sumners wrote:
>>>>> I need to get the IP address of the local machine on which a script is
>>>>> being executed. The script is going to be run by an unprivileged user
>>>>> (so /sbin is not in the PATH). Does anyone know of a better way than
>>>>> this:
>>>>>
>>>>> IP=$(host $(hostname) | awk '{print $4}')
>>>>>
>>>> I never trust the PATH in scripts.  Anyone can call /sbin/ifconfig.
>>>> If you must, just add :/sbin to your PATH (ew).
>>> Like JD said, you do not need to be root to run ifconfig:.
>>>
>>> [warlord at dev webdav]$ whoami
>>> warlord
>>> [warlord at dev webdav]$ /sbin/ifconfig wlan0
>>> wlan0     Link encap:Ethernet  HWaddr 00:21:6A:90:98:58
>>>           inet addr:192.168.248.100  Bcast:192.168.248.255  Mask:255.255.255.0
>>> ...
>>> [warlord at dev webdav]$ /sbin/ifconfig wlan0 | grep 'inet addr' | tr : ' ' | awk '{print $3}'
>>> 192.168.248.100
>> You probably can't guarantee that the device will be wlan0.  Further,
>> you can combine your grep, awk, and tr into a single awk script:
>>
>> ifconfig| awk -F'[" ":]' '/Bcast/ {print  $16, NF}'
>>
>> Note, I've looking for Bcast, should match any configured interfaces.
>> Problem is, if you have more then one interface configured....
>>
>>
>>> -derek
>>
>> --
>> Until later, Geoffrey
>>
>> "I predict future happiness for America if they can prevent
>> the government from wasting the labors of the people under
>> the pretense of taking care of them."
>> - Thomas Jefferson
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> 
> 
> 


-- 
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson