Example session on a 4.3BSD Unix (vax-780)
User input in bold face.

    $ vax780 run.conf

VAX780 simulator V3.8-1
Listening on port 2311 (socket 6)
Modem control activated

Boot
: ra(0,0)vmunix
279844+80872+100324 start 0x12f8
4.3 BSD UNIX #1: Fri Jun  6 19:55:29 PDT 1986
    karels@monet.Berkeley.EDU:/usr/src/sys/GENERIC
real mem  = 8388608
SYSPTSIZE limits number of buffers to 140
avail mem = 7187456
using 140 buffers containing 524288 bytes of memory
mcr0 at tr1
mcr1 at tr2
uba0 at tr3
hk0 at uba0 csr 177440 vec 210, ipl 15
rk0 at hk0 slave 0
rk1 at hk0 slave 1
rk2 at hk0 slave 2
rk3 at hk0 slave 3
uda0 at uba0 csr 172150 vec 774, ipl 15
ra0 at uda0 slave 0
zs0 at uba0 csr 172520 vec 224, ipl 15
ts0 at zs0 slave 0
dz0 at uba0 csr 160100 vec 300, ipl 15
Changing root device to ra0a
Automatic reboot in progress...
Mon Dec 18 08:37:13 PST 2000
/dev/ra0a: 399 files, 4649 used, 2780 free (4 frags, 347 blocks, 0.1% fragmentation)
/dev/rra0h: 15739 files, 94111 used, 44473 free (185 frags, 5536 blocks, 0.1% fragmentation)
/dev/rra0g: 2 files, 9 used, 245216 free (16 frags, 30650 blocks, 0.0% fragmentation)
Mon Dec 18 08:37:21 PST 2000
checking quotas: done.
starting system logger
checking for core dump... /a/crash: No such file or directory
Dec 18 08:37:22 myname savecore: /a/crash: No such file or directory

starting local daemons: namedDec 18 08:37:22 myname named[53]: No root Nameserver
 sendmail.
preserving editor files
clearing /tmp
standard daemons: update cron accounting.
starting network daemons: rwhod inetd printer.
Mon Dec 18 08:37:23 PST 2000


4.3 BSD UNIX (myname.my.domain) (console)

login: root
Last login: Mon Dec 18 08:27:37 on console
Dec 18 08:38:07 myname login: ROOT LOGIN console
4.3 BSD UNIX #1: Fri Jun  6 19:55:29 PDT 1986

Would you like to play a game?

Don't login as root, use su
myname# ps afx
  PID TT STAT  TIME COMMAND
    0 ?  D     0:00 swapper
    1 ?  S     0:00 init
    2 ?  D     0:00 pagedaemon
   46 co S     0:00 /etc/syslogd
   53 ?  I     0:00 /etc/named /etc/named.boot
   58 ?  I     0:00 /usr/lib/sendmail -bd -q30m
   59 ?  I     0:00 -running queue (sendmail)
   68 ?  I     0:00 /etc/update
   71 ?  S     0:00 /etc/cron
   79 ?  I     0:00 /etc/rwhod
   83 ?  I     0:00 /etc/inetd
   88 ?  I     0:00 /usr/lib/lpd
   93 co S     0:00 -csh (csh)
  105 co R     0:00 ps afx
   94 00 I     0:00 - std.9600 tty00 (getty)
   95 01 I     0:00 - std.9600 tty01 (getty)
   96 02 I     0:00 - std.9600 tty02 (getty)
   97 03 I     0:00 - std.9600 tty03 (getty)
   98 04 I     0:00 - std.9600 tty04 (getty)
   99 05 I     0:00 - std.9600 tty05 (getty)
  100 06 I     0:00 - std.9600 tty06 (getty)
  101 07 I     0:00 - std.9600 tty07 (getty)
myname# cd /usr/src/sys/GENERIC
myname# setenv TERM vt100
myname# vi ../sys/kern_exec.c
   { insert the ff. in kern_exec.c l.159:   printf (" have #! detected\n"); }
myname# make
cc -c -S -I. -I../h -DGENERIC -DVAX730 -DVAX750 -DVAX780 -DVAX8600 -DTCP_COMPAT_42 -DNS -DINET -DQUOTA -DKERNEL ../sys/kern_exec.c
/lib/c2 kern_exec.s | ../vax/inline/inline  | as -o kern_exec.o
rm -f kern_exec.s
loading vmunix
rearranging symbols
text    data    bss     dec     hex
279860  80884   100324  461068  7090c
myname# cp vmunix /
myname# halt
    { and reboot }
...
# cat > try
#!/bin/sh
echo x
<ctrl-d>
# chmod u+x try
# ./try
 have #! detected
x
#

<http://www.in-ulm.de/~mascheck/various/ancient/43bsd.html>