On Mon, Mar 16, 2020 at 11:54:28AM +0000, Quentin Monnet wrote: > [...] > > > +static int do_unregister(int argc, char **argv) > > +{ > > + const char *search_type, *search_term; > > + struct res res; > > + > > + if (argc != 2) > > + usage(); > > Or you could reuse the macros in main.h, for more consistency with other > subcommands: > > if (!REQ_ARGS(2)) > return -1; Thanks for the review! I prefer to print out "usage();" whenever possible but then "-j" gave me a 'null' after a json error mesage ... # bpftool -j struct_ops unregister {"error":"'unregister' needs at least 2 arguments, 0 found"},null Then I went without REQ_ARGS(2) which is similar to a few existing cases like do_dump(), do_updaate()...etc in map.c. That was my consideration. However, I can go back to use REQ_ARGS(2) and return -1 without printing usage. no strong preference here.