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diff --git a/share/doc/psd/20.ipctut/ustreamwrite.c b/share/doc/psd/20.ipctut/ustreamwrite.c
new file mode 100644
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--- /dev/null
+++ b/share/doc/psd/20.ipctut/ustreamwrite.c
@@ -0,0 +1,71 @@
+.\" Copyright (c) 1986, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)ustreamwrite.c	8.1 (Berkeley) 6/8/93
+.\"
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdio.h>
+
+#define DATA "Half a league, half a league . . ."
+
+/*
+ * This program connects to the socket named in the command line and sends a
+ * one line message to that socket. The form of the command line is
+ * ustreamwrite pathname 
+ */
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int sock;
+	struct sockaddr_un server;
+	char buf[1024];
+
+	/* Create socket */
+	sock = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (sock < 0) {
+		perror("opening stream socket");
+		exit(1);
+	}
+	/* Connect socket using name specified by command line. */
+	server.sun_family = AF_UNIX;
+	strcpy(server.sun_path, argv[1]);
+
+	if (connect(sock, &server, sizeof(struct sockaddr_un)) < 0) {
+		close(sock);
+		perror("connecting stream socket");
+		exit(1);
+	}
+	if (write(sock, DATA, sizeof(DATA)) < 0)
+		perror("writing on stream socket");
+}