Re: Trying to replace a bashism in bourne sh

On 2023-11-07 02:21, Arthur Chance wrote:
> On 06/11/2023 18:45, D'Arcy Cain wrote:
>> I need to do this;
>>
>>    ifconfig_eth3="inet $((16#c0a8c0${me} + 100))/24"
>>
>> Problem is that I need to do this at boot time but then it runs as
>> bourne sh.  Does anyone have an equivalent for sh?
> 
> I'm not totally familiar with bash but that (16#c0a8c0) is a hexadecimal
> number equivalent to an address triplet 192.168.192. I'd guess ${me} is

I should have explained more.  Basically I have a bunch of servers all 
on the same network.  I have two ethernet (or more) interfaces on each. 
I am setting up both IPV4 and IPV6 on both the public and the private 
side.  I have a script that gets sourced into a small rc.conf for each 
server.  The idea was to use the same last octet on every interface.

In the server rc.conf I have something like this:

hostname="smaug.vex.net"
me=44 # 68
. /blah/rc.conf # common code

I use hex for "me" so that I can create IPV6 addresses.  So far so good.

Recently, someone else set up iLO on some of the servers.  To access iLO 
she used one of the extra ports on the servers with more than two and 
put a separate network on it.  For some reason she says that she can't 
use the same last octet for that address as the other interfaces.  I 
don't know enough about iLO yet to understand why so I am just adding 
the 100 as she did.  At least I don't have to worry about IPV6 right now.

-- 
D'Arcy J.M. Cain <darcy@druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 788 2246     (DoD#0082)    (eNTP)   |  what's for dinner.
IM: darcy@Vex.Net, VoIP: sip:darcy@druid.net