From the SGI Discord (link)

gdb -> dbx cheatsheet
---------------------

b       stop at [line]/stop in [func]/stop [expression|variable]
bt      where
w       stop [var]
c       cont
tb      cont at line
disp    trace
s       step
n       next
        return
p       print
p/x     print x or px
f       func [level|function]
        also up/down the stack
call    ccall
        p func(...)
i r     printregs or pr
        px $r0