Exhibition services

The machines share the internal exhib.unix network. From any exhibition machine, you can reach the others by their short names or fully qualified hostnames:

reno.exhib.unix: 4.3BSD-Reno
sunos5.exhib.unix: SunOS 5.6
ultrix4.exhib.unix: Ultrix 4.5
netbsd1.exhib.unix: NetBSD 1.0

The 192.168.104.0/24 network is isolated. The machines can query the exhibition's DNS servers at 192.168.100.4 and 192.168.100.5 and use ICMP, so you can ping another exhibition host or an internet address. Other outbound network connections are blocked.

% ping reno
% ping 1.1.1.1

Mail

Sendmail runs on every exhibition host. You can exchange mail with the shared users on any machine, but mail cannot be sent to or received from the internet.

Use the mail program provided by the system:

4.3BSD-Reno: /usr/bin/mail
Ultrix 4.5: /usr/ucb/mail
SunOS 5.6 and NetBSD 1.0: /usr/bin/mailx

To send a message with mail, end the body with a period on a line by itself:

% mail -s "Important Subject" alice@reno
Type your message here
and end it with a period on a separate line.
.
Cc:
%

mailx works in much the same way:

% mailx -s "Another subject" bob@netbsd1.exhib.unix
The message goes here and
is also terminated with a period on a separate line.
.
EOT
%

Run mail or mailx without arguments to read your messages.

Finger

Finger is enabled on every machine. To see who is logged in to a particular host, run:

% finger @reno
[reno.exhib.unix]
Login    Name                 Tty  Idle  Login        Office     Office Phone
alice    Alice Smith           p1     7  Jul 19 12:35

Specify a user to see more information about them:

% finger alice@reno
[reno.exhib.unix]
Login: alice                           Name: Alice Smith
Directory: /usr/users/alice            Shell: /bin/csh
On since Fri Jul 19 12:35 (MET DST) on ttyp1, idle 0:05, from dhclient-03.dhcp
Project:
* Finding a way out of the rabbit hole
Plan:
* Follow the white rabbit
* Don't get my head chopped off by the Red Queen

Who is online?

All machines run rwhod. Use rwho to see logged-in users across the entire exhibition:

% rwho
alice    reno:ttyp1    Jul 19 12:35
alice    sunos5:pts/1  Jul 19 15:24
bob      netbsd1:ttyp0 Jul 19 15:23 :05
bob      ultrix4:ttyp0 Jul 19 15:22 :08

ruptime shows the uptime and load of every host:

% ruptime
netbsd1       up     2:20,     1 user,   load 0.03, 0.02, 0.00
reno          up  8+02:11,     1 user,   load 0.00, 0.01, 0.02
sunos5           up ??:??,     1 user,   load 0.00, 0.06, 0.06
ultrix4       up     4:19,     1 user,   load 0.00, 0.00, 0.00