printfmtstrings
printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
printfmtstrings(he->h_aliases, " ", " ", "%-39s %s", buf, he->h_name);
printfmtstrings(pe->p_aliases, " ", " ", \
printfmtstrings(re->r_aliases, " ", " ", \
printfmtstrings(se->s_aliases, " ", " ", \