script for checking own ip address

Hi all,
I am building a script for unison. I need to check if I'm on my local
network or at school/work.
If I am at school/work, unison should synchronize with xxxx.dyndns.org, if
I'm at home it should synchronize with the same server in the local
network, e.g. 192.168.0.1. How can I find out what ip address I have? I
tried "ifconfig |grep -A 1 eth1 | grep inet" but it gives back a whole
line. How can i just get the ip address? Thanks in advance for any answer.
Regards,
Marcio

On Thu, 03 Nov 2005 23:17:09 +0100, Marcio Cordero
<(E-Mail Removed)> wrote:

>ifconfig |grep -A 1 eth1 | grep inet

very dirty (my scripts are full of these lousy solutions but they
work):
ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}

janm

Am Thu, 03 Nov 2005 23:30:13 +0100 schrieb Jan Mannoury:

> On Thu, 03 Nov 2005 23:17:09 +0100, Marcio Cordero
> <(E-Mail Removed)> wrote:
>
>>ifconfig |grep -A 1 eth1 | grep inet
>
> very dirty (my scripts are full of these lousy solutions but they
> work):
> ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}
Works prefectly. Thanks janm!
>
> janm

Am Thu, 03 Nov 2005 23:30:13 +0100 schrieb Jan Mannoury:

> On Thu, 03 Nov 2005 23:17:09 +0100, Marcio Cordero
> <(E-Mail Removed)> wrote:
>
>>ifconfig |grep -A 1 eth1 | grep inet
>
> very dirty (my scripts are full of these lousy solutions but they
> work):
> ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}
Ok, that works. Now how can I check if the ip address fits in a address
range?
I'm using the following:
x=`ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}`

And then:
if [ "$x" = "192.168.0.*" ]; do
....
but I'm not sure this works. How can I find out if it's working or does
anyone have a better solution for that test?
TIA and regards,
Marcio

>
> janm

On Fri, 04 Nov 2005 01:25:05 +0100, Marcio Cordero wrote:
> I'm using the following:
> x=`ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}`
>
> And then:
> if [ "$x" = "192.168.0.*" ]; do
> ...
> but I'm not sure this works.

Guessing NOT.

> How can I find out if it's working

put it in a file, chmod +x filename_here

Add a line after if like
echo "It worked"
save and exit, then do a

../filename_here

to debug, you can add a
set -xv
as frist/second line of script.

set -
as last line of script you want to watch.

For extra points, read
! bash script introduction documentation
http://tldp.org/LDP/intro-linux/html/index.html
! bash script advanced documentation
http://tldp.org/LDP/abs/html/index.html

Am Thu, 03 Nov 2005 18:37:26 -0600 schrieb Bit Twister:

> On Fri, 04 Nov 2005 01:25:05 +0100, Marcio Cordero wrote:
>> I'm using the following:
>> x=`ifconfig |grep -A 1 eth1 | grep inet |column -t -s: |awk {'print $3'}`
>>
>> And then:
>> if [ "$x" = "192.168.0.*" ]; do
>> ...
>> but I'm not sure this works.
>
> Guessing NOT.
>
>> How can I find out if it's working
>
> put it in a file, chmod +x filename_here
>
> Add a line after if like
> echo "It worked"
> save and exit, then do a
>
> ./filename_here
>
> to debug, you can add a
> set -xv
> as frist/second line of script.
>
> set -
> as last line of script you want to watch.
>
> For extra points, read
> ! bash script introduction documentation
> http://tldp.org/LDP/intro-linux/html/index.html
> ! bash script advanced documentation
> http://tldp.org/LDP/abs/html/index.html

Test contructs was what I was looking for... thanks Bit Twister, it works
now!