Behave like GNU time. More cleanup. Reword man page.

Pointed out by:	Bruce Evans

usr.bin/time/time.1

@@ -39,9 +39,9 @@
 .Nd time command execution
 .Sh SYNOPSIS
 .Nm
-.Op Fl a Ar file
-.Op Fl o Ar file
 .Op Fl l
+.Op Fl a
+.Op Fl o Ar file
 .Ar command
 .Sh DESCRIPTION
 The
@@ -68,25 +68,25 @@ process.
 .Pp
 Available options:
 .Bl -tag -width Ds
-.It Fl a Ar file
+.It Fl l
-Append the output of
+The contents of the
-.Nm
+.Em rusage
-to 
+structure are printed as well.
-.Ar file
+.It Fl a
-instead of writing to stderr.
+If the
+.Fl o
+flag is used, append to the specified file rather than overwriting
+it. Otherwise, this option has no effect.
 .It Fl o Ar file
 Write the output to 
 .Ar file
 instead of stderr.  If
 .Ar file
-exists, then 
+exists and the
-.Nm
+.Fl a
-will overwrite the file if its permissions allow it.
+flag is not specified, the file will be overwritten.
-.It Fl l
-The contents of the
-.Em rusage
-structure are printed as well.
 .El
+.Sh NOTES
 .Pp
 The
 .Xr csh 1
@@ -98,7 +98,6 @@ is available as
 to
 .Xr csh
 users.
-.Sh NOTES
 The output of
 .Nm
 can be directed to standard output by specifying

usr.bin/time/time.c

@@ -42,7 +42,7 @@ static const char copyright[] =
 static char sccsid[] = "@(#)time.c	8.1 (Berkeley) 6/6/93";
 #endif
 static const char rcsid[] =
-	"$Id: time.c,v 1.7 1998/07/24 07:19:29 phk Exp $";
+	"$Id: time.c,v 1.8 1998/07/27 16:08:58 des Exp $";
 #endif /* not lint */
 
 #include <sys/types.h>
@@ -78,17 +78,12 @@ main(argc, argv)
 	char *ofn = NULL;
 
 	lflag = 0;
-	while ((ch = getopt(argc, argv, "a:o:l")) != -1)
+	while ((ch = getopt(argc, argv, "lao:")) != -1)
 		switch((char)ch) {
 		case 'a':
-		        if (ofn)
-			        usage();
-			ofn = optarg;
 			aflag = 1;
 			break;
 		case 'o':
-		        if (ofn)
-			        usage();
 			ofn = optarg;
 			break;
 		case 'l':
@@ -187,7 +182,7 @@ main(argc, argv)
 static void
 usage()
 {
-	fprintf(stderr, "usage: time [-l] [-{o|a} file] command\n");
+	fprintf(stderr, "usage: time [-l] [-a] [-o file] command\n");
 	exit(EX_USAGE);
 }