Struggling to get correct answer….. IP Range

There is no direct way to define an ip range in a capture filter syntax. The maximum you can do is to use a combination of net and host expressions, like (net 192.168.2.8/29 and not host 192.168.2.8 and not host 192.168.2.9) or (net 192.168.2.16/28 and not host 192.168.2.31) for your particular case, to make the condition shorter than a plain list of host x.x.x.x expressions.

For a display filter, ip.addr >= 192.168.2.10 and ip.addr <= 192.168.2.30 does what you want, and for tshark with -w option, a display filter has the same effect on the output capture file like a capture filter (there are differences but in this case I think you can neglect them).

Depending on your use case, for Wireshark use, it might make sense to use a wider capture filter (like net 192.168.2.0/27) to reduce the amount of captured packets, then apply the display filter above to show only the ones you really wanted, and then use File -> Export Selected Packets -> Displayed to save only the shown ones to a new file.