Shell script to give broadcast and network address

Shell Programming and Scripting
1

Hello,

I am running a post script in autoyast where I am trying to set the broadcast and network address.

I have the ip address and netmask already (reading from a file)..

I saw the post from fpmurphy but it is using ksh which isn't an option in autoyast.

Thanks in advance!

2

Isn't the ip address the network address?

Last I checked, the broadcast address = ~netmask | ip (top address), although sometime I think netmask & ip would also work (bottom address), yup, it does.

Can you call executables, or run somethng earlier to make it easy to pick up, like from the environment?

3

I run my suse install and at the end I ask for the following -

Ip address
Subnet Mask
Hostname

I put them in different files (ie /tmp/ip /tmp/netm etc).

I want to reference that to pull the Network addr and Broadcast addr -

Example -

/tmp/ip
10.20.18.10
/tmp/netm
255.255.240.0

Give me -

Network Address: 10.20.16.0
Broadcast Address: 10.20.31.255

My script writes more that that but the only portion that fails is the part that determines and writes the network address and broadcast address..

4

Run something like his script earlier or one time, and have it leave the results for each somewhere accessible to your script?