how do you distinguish between connection types?

[J. de Haan]

Hi all,

how do you distinguish between connection types? When I connect to a HPUX machine through various means (telnet, dtterm, xterm (local&remote), console) I want to be able to recognize each possible type of connection in /etc/profile to provide the right environment for that type of connection. When I run 'who', I see various types (console, pts/n, dtremote, pts/tx, ttynpn) but I couldn't find documentation on how to test on these, nor what each is, though console obviously is a serial connection.

Thanks for any insight in this.

Sincerely,

Jan de Haan.

[Michael Tully]

CDE login = dtremote (.dtprofile)
console = console
telnet = pts/NN (number is in hex)
terminal/modem = tty

[J. de Haan]

Michael,

you're right in your assignments, but what I really like to know is how to test for them in the various login scripts (/etc/profile, .dtprofile etc.)

Thanks for your fast reply.

Jan.

[Bill Thorsteinson · Accepted solution]

CDE runs the .dtprofile script
not .profile.

pty -s will set the return code to indicated if you
are on a pseudo-terminal.
If you are you have a dtterm or xterm connection. You
may be able to determine
which by looking at the
$TERM variable.


The command
ps | tail -1 | awk '{print $2}'
will return the device
you are connected on.
You can case on this to determine console, tty, pty.

tty -s will set the return
code to indicate if you
are on a terminal. Use this
to determin if you are running
in batch mode.

[Jordan Bean]

You could use `lssf $(tty)` to determine the driver used by the device. Please note that tty also works for pty devices, but not the other way around. Take a look at the differences:

From a C3600 running HPUX 11.00 64-bit June 2002:
$ lssf /dev/console /dev/ttyp0 /dev/pts/1 /dev/pts/t1
pseudo driver cn minor 0x000000 /dev/console
pseudo driver ptys minor 0x000000 /dev/ttyp0
pseudo driver pts minor 0x000001 /dev/pts/1
pseudo driver tels minor 0x000034 /dev/pts/t1

We know the console is on the cn device and that other hardwired terminals are ptys devices. We also know that a telnet session grabs a tels device. But it gets tricky with ssh, rlogin, xterm, etc which all use pts devices (and sometimes ptys).

I may comment more later. Until then, I hope you find others' remarks more useful.