Arg parsing didn't check for duff args (written for an early version
of ARGBEGIN ARGEND ?), thus "grep -f" suicide'ed. fixed with EARGF().

-Steve

Reference: /n/sources/patch/applied/tiny-grep-silly
Date: Sun Aug  8 05:39:51 CES 2004

--- /sys/src/cmd/grep/main.c	Sun Aug  8 05:39:50 2004
+++ /sys/src/cmd/grep/main.c	Sun Aug  8 05:39:50 2004
@@ -24,12 +24,12 @@
 	case 'e':
 		flags['e']++;
 		lineno = 0;
-		str2top(ARGF());
+		str2top(EARGF(usage()));
 		break;
 
 	case 'f':
 		flags['f']++;
-		filename = ARGF();
+		filename = EARGF(usage());
 		rein = Bopen(filename, OREAD);
 		if(rein == 0) {
 			fprint(2, "grep: can't open %s: %r\n", filename);