Mid id.c /^main(argc, argv)$/ current id.c /^current()$/ err id.c /^err(fmt, va_alist)$/ group id.c /^group(pw, nflag)$/ pretty id.c /^pretty(pw)$/ usage id.c /^usage()$/ user id.c /^user(pw)$/ who id.c /^who(u)$/