🚀 go-pugleaf

I am not sure if this is right forum to ask this question (please
let me know what is).

Can I use artificial arrays on the left-hand-side of a `set variable'
command? For example, if there are two arrays a[10] and b[10], can I
say something like `set a[1]@3 = b[6]@3'? When I tried this in gdb, it 
didn't complain, but it didn't do the expected -- setting a[1], a[2],
a[3] to b[6], b[7], b[8] respectively. It simply mauled the value of 
a[1].

Is there any other command to do this? I understand that I could define 
convenience variables for indices in the two arrays and then assign 
individual elements incrementing the indices simultaniously. But I am
looking at something more general.

Is there a way I can overwite N bytes starting at address X with N 
given bytes? 

I'll appreciate any help. Thanks.

--Hira.