1998-03-09 15:50:56 +00:00

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GNO Manual Addendum
This file contains information on parts of GNO that changed after
the documentation was printed.
Known Bugs
The default gshrc file created by the installer generates a $HOME
directory that uses colon delimiters (e.g., :hd1:gno:user:root). A bug
in handling the ~ character causes attempts to, for example, "ls ~/foo"
to fail, because that gets interpreted as "ls :hd1:gno:user:root/foo",
where the system interprets "root/foo" as a single filename. You should
either change the gshrc file to use '/' delimiters, or use the ':'
delimiter when also using ~ (i.e., "ls ~:foo")
Getty (2.0.3)
The 'getty' program provided with GNO 2.0.3 and later has a new feature and
a fixed bug.
o Getty used to overrun its stack space in ways that were hard to
detect; this has been fixed
o There is a new type of entry in the gettytab file:
The 'hu#' entry represents the RS232 signal line that is to be
used as carrier detect, and thus will cause a SIGHUP signal to
be sent to the processes running on that port. In this example,
'8' indicates a '1' in bit 3 of the following byte:
[7] break/abort
[6] tx underrun
* [5] DSR (input handshake line)
[4] reserved
* [3] DCD (general purpose input line)
[2] tx buff empty
[1] reserved
[0] rx char available
The only lines that have any meaning are marked with '*'s. The
default line is #5 (value 32) due to the strange wiring of some
modem cables. Setting this value to zero (0) turns off hangup
checking completely.
How to Control Serial Ports with stty
'stty' is short for 'set tty parameters', and can be used to control
various aspects of the serial ports and other terminal devices.
stty modifies the parameters of the terminal that stty's standard input
references; e.g., to modify .ttya parameters, do something like this:
stty ... < .ttya
To set the baud rate, simply enter the baud rate you want on the command line.
e.g., to set the printer port's baud rate to 19200 baud, do
stty 19200 <.ttyb
The various other parameters that stty supports are described in the tty(4)
manual page.
How to use the Multi-User package
If you choose to install the multi-user package, the nature of the GNO
system changes quite a bit. First off, instead of GNO simply being a shell
on your IIGS's screen, the console becomes a terminal through which you
can log into the system.
When you start GNO after installing the MU package, you'll see some intro
text (terminal name, and name of the computer), and then a 'login' prompt.
At this prompt, users type in their unique user names (and normally a
password) to gain entry to your computer. GNO comes with one user already
configured : 'root'. To get into GNO the first time, type 'root' at the
login prompt. No password is set by default, so you won't be asked for one.
If you want to protect entry to your computer with a password, use the 'passwd'
command to change your password.
% passwd
You'll be prompted for your old password, which is nothing - so hit return.
Then you type in the new password - twice, to make sure you entered it
correctly. This is done because, sensibly, when entering a password the
keys you type are not echoed on the screen.
Don't forget your password! If you do, you'll have to manually edit the
/etc/passwd file, and delete the second field; the one right after the username
and a colon (:), and that looks like gibberish because it's encrypted. Delete
everything between the two colons to remove the password.
There are two ways to exit GNO with the MU package installed; simply typing
'exit' at the shell will only return to the login prompt.
'init 5' at the shell will cause GNO to shut down and return to the program
launcher you used to run GNO (usually the Finder).
'init 0' will shut down GNO and will reboot your computer.
There is a file that contains a log of activity on the system, including
bad attempts to log in. This file is /var/adm/syslog. Typing
'more /var/adm/syslog' from the shell will display the contents of this file.
Other applications may also use the syslog file to record notable events.
How to use the line printer daemon
(or, lpr is your friend)
The print spooling system included with GNO is very versatile because it
takes advantage of GNO's multitasking capabilities. Anyone can write a program
that communicates with lpd (line printer daemon) to spool a print job. At
this time the communication specification is not yet available; contact Procyon
for more information.
You must start lpd differently depending on whether you're using the MU package
or using GNO in single-user mode. For single-user, simply type
/usr/sbin/lpd &
To start the spooler process.
With MU, simply uncomment (remove the '#') the line in the /etc/inittab file
corresponding to lpd. Then, lpd will be started automatically whenever you
run GNO. Note that either way you start lpd, it is currently limited to
using the printer baud rate specified in the IIGS control panel, and to
using serial printers. lpd does not work with laser printers hooked up via
an AppleTalk network. It also requires you to use the printer port.
There are currently two programs that use lpd; lpr, and FilePort. lpr is
the standard UNIX 'print a text file' program. Typing
lpr file1 file2 ...
will print the text files you list, adding headers and page numbers.
FilePort is a GS/OS printer driver that works with desktop applications.
To turn it on, use the Control Panel NDA, select 'DC Printer', and choose
your printer type and 'FilePort' (for 'Port').
From then on, whenever you print from a desktop program in GNO, the output
will be spooled. If you wish to print from outside GNO, you will have to
choose the regular port driver again in the Control Panel NDA (usually