Don't clutter the output with closed connection info unless threatened
with -a.

Notes:
Wed Feb 3 15:27:45 EST 2010 geoff
    I don't think that we want to change the default usage
    of netstat at this late date.


Reference: /n/sources/patch/sorry/netstat-open
Date: Sun Nov  8 06:01:41 CET 2009
Signed-off-by: lyndon@orthanc.ca
Reviewed-by: geoff

--- /sys/src/cmd/netstat.c	Sun Nov  8 05:59:47 2009
+++ /sys/src/cmd/netstat.c	Sun Nov  8 05:59:45 2009
@@ -13,11 +13,11 @@
 char *proto[20];
 int nproto;
 int	notrans;
-
+int showall;
 void
 usage(void)
 {
-	fprint(2, "usage: %s [-in] [-p proto] [network-dir]\n", argv0);
+	fprint(2, "usage: %s [-ain] [-p proto] [network-dir]\n", argv0);
 	exits("usage");
 }
 
@@ -30,6 +30,9 @@
 	char buf[128];
 
 	ARGBEGIN{
+	case 'a':
+		showall = 1;
+		break;
 	case 'i':
 		justinterfaces = 1;
 		break;
@@ -144,6 +147,9 @@
 	buf[n] = 0;
 	close(fd);
 
+	if(!showall)
+		if(strncmp(buf, "Closed ", 7) == 0)
+			return;
 	p = strchr(buf, ' ');
 	if(p != 0)
 		*p = 0;
--- /sys/man/1/netstat	Sun Nov  8 05:59:50 2009
+++ /sys/man/1/netstat	Sun Nov  8 05:59:48 2009
@@ -4,7 +4,7 @@
 .SH SYNOPSIS
 .B netstat
 [
-.B -in
+.B -ain
 ] [
 .B -p
 .I proto
@@ -26,6 +26,9 @@
 remote address.
 .PP
 The options are:
+.TP
+.B -a
+Also print information about closed connections.
 .TP
 .B -i
 Instead of the usual listing, print one line per network interface.