Enhance realpath(1) in a number of ways:

- Allow realpath to accept multiple paths on the command line.
- Add -q to suppress warnings if some paths can't be processed, and use
  getopt(3) to process flags.
- Print the path being requested rather than a possibly partially
  processed path when a failure occurs so that you can tell which of
  several passed paths did fail.

MFC after:	1 week
PR:		112920
Submitted by:	Ighighi <ighighi@gmail.com>

bin/realpath/realpath.1

@@ -41,7 +41,9 @@
 .Nd return resolved physical path
 .Sh SYNOPSIS
 .Nm
+.Op Fl q
 .Ar path
+.Op Ar ...
 .Sh DESCRIPTION
 The
 .Nm
@@ -55,6 +57,12 @@ and
 .Pa /../
 in
 .Ar path .
+.Pp
+If
+.Fl q
+is specified, warnings will not be printed when
+.Xr realpath 3
+fails.
 .Sh EXIT STATUS
 .Ex -std
 .Sh SEE ALSO

bin/realpath/realpath.c

@@ -44,20 +44,39 @@ main(int argc, char *argv[])
 {
 	char buf[PATH_MAX];
 	char *p;
+	int ch, i, qflag, rval;
 
-	if (argc == 2) {
-		if ((p = realpath(argv[1], buf)) == NULL)
-			err(1, "%s", buf);
-	} else
+	qflag = 0;
+	while ((ch = getopt(argc, argv, "q")) != -1) {
+		switch (ch) {
+		case 'q':
+			qflag = 1;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc < 1)
 		usage();
-	(void)printf("%s\n", p);
-	exit(0);
+	rval  = 0;
+	for (i = 0; i < argc; i++) {
+		if ((p = realpath(argv[i], buf)) == NULL) {
+			if (!qflag)
+				warn("%s", argv[i]);
+			rval = 1;
+		} else
+			(void)printf("%s\n", p);
+	}
+	exit(rval);
 }
 
 static void
 usage(void)
 {
 
-	(void)fprintf(stderr, "usage: realpath path\n");
+	(void)fprintf(stderr, "usage: realpath [-q] path [...]\n");
   	exit(1);
 }