ref: 11b5c4b8bf0a15777e9a7f2292f6c80f5a7b4a2d dir: /sys/src/cmd/rc/getflags.h/
#define NFLAG 128 extern char **flag[NFLAG]; extern char *cmdname; extern char *flagset[]; int getflags(int, char*[], char*, int);