struct command
{
    char *command;
    Handler handler;
    char *usage;
} cmd_handles[] = {
    { "procs",
      do_procs,
    "list the known processes"},
    { "files",
      do_files,
    "list the known files"},
    { "showmaps",
      do_showmaps,
    "list the maps of a particular process"},
    { NULL, NULL, NULL },
};