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From: J G Miller on 3 Oct 2009 06:58
On Sat, 03 Oct 2009 10:44:14 +0000, no.top.post wrote:

> But I dont know if/what to use to replace "HOSTNAME" to have PS1
> show the VTnumber.

The tty command reports which tty you are on. The virtual consoles
are on /dev/tty1 .. /dev/tty10, so check that tty reports back a
/dev/ttyN and use that N for displaying "vtN" in your prompt.

tt_number="`tty | sed -ne 's|/dev/tty||p'`"

if [ -n ${tt_number} ]
then
echo "You are on virtual console number ${tt_number]"
else
echo "You are not on a virtucal console."
fi

When executed on a terminal emulator (et xterm, Eterm etc) tty
will report /dev/pts/N where N is a number from 0 to ... N

From: J G Miller on 3 Oct 2009 07:32
On Sat, 03 Oct 2009 10:58:11 +0000, J G Miller wrote:

> if [ -n ${tt_number} ]

I omitted essential quotes -- that should be

if [ -n "${tt_number}" ]

otherwise the script will fall all when tt_number is blank.

From: Chris F.A. Johnson on 3 Oct 2009 14:48
On 2009-10-03, J G Miller wrote:
> On Sat, 03 Oct 2009 10:44:14 +0000, no.top.post wrote:
>
>> But I dont know if/what to use to replace "HOSTNAME" to have PS1
>> show the VTnumber.
>
> The tty command reports which tty you are on. The virtual consoles
> are on /dev/tty1 .. /dev/tty10, so check that tty reports back a
> /dev/ttyN and use that N for displaying "vtN" in your prompt.
>
> tt_number="`tty | sed -ne 's|/dev/tty||p'`"
>
> if [ -n ${tt_number} ]
> then
> echo "You are on virtual console number ${tt_number]"
> else
> echo "You are not on a virtucal console."
> fi
>
> When executed on a terminal emulator (et xterm, Eterm etc) tty
> will report /dev/pts/N where N is a number from 0 to ... N

TTY=$(tty)
TTYNUM=${TTY##*[^0-9]}

--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence
From: J G Miller on 3 Oct 2009 16:05
On Sat, 03 Oct 2009 18:48:08 +0000, Chris F.A. Johnson wrote:

> TTYNUM=${TTY##*[^0-9]}

Yes that is much simpler but it is a Bashism which will not work under
Bourne shell (or /bin/dash) and is therefore not portable.

From: pk on 3 Oct 2009 16:07
J G Miller wrote:

> On Sat, 03 Oct 2009 18:48:08 +0000, Chris F.A. Johnson wrote:
>
>> TTYNUM=${TTY##*[^0-9]}
>
> Yes that is much simpler but it is a Bashism which will not work under
> Bourne shell (or /bin/dash) and is therefore not portable.

No.
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