grep: add -h (inverse of -H) aswell

grep.1

@@ -3,7 +3,7 @@
 grep \- search files for a pattern
 .SH SYNOPSIS
 .B grep
-.RB [ \-EHcilnqv ]
+.RB [ \-EHchilnqv ]
 .RB [ \-e
 .I pattern ]
 .I pattern
@@ -38,6 +38,9 @@ This option is most useful when multiple -e options are used to
 specify multiple patterns, or when a pattern begins with a dash
 (`-').
 .TP
+.B \-h
+do not prefix each line with 'filename:' prefix.
+.TP
 .B \-i
 matches lines case insensitively.
 .TP

grep.c

@@ -16,6 +16,7 @@ static int grep(FILE *, const char *);
 
 static int eflag = 0;
 static int vflag = 0;
+static int hflag = 0;
 static int Hflag = 0;
 static int many;
 static char mode = 0;
@@ -54,6 +55,9 @@ main(int argc, char *argv[])
 		addpattern(EARGF(usage()));
 		eflag = 1;
 		break;
+	case 'h':
+		hflag = 1;
+		break;
 	case 'c':
 	case 'l':
 	case 'n':
@@ -145,7 +149,7 @@ grep(FILE *fp, const char *str)
 			case 'q':
 				exit(Match);
 			default:
-				if (many || Hflag)
+				if (!hflag && (many || Hflag))
 					printf("%s:", str);
 				if (mode == 'n')
 					printf("%ld:", n);