[gentoo-user] Test for X from cli

[gentoo-user] Test for X from cli

[John J. Foster]

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Good afternoon,

In a bash script, how can I test whether the script itself is being
run from a virtual terminal, or from an emulator like konsole within X?

Thanks,
festus
-- 
Ambition is a poor excuse for not having enough sense to be lazy.

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Re: [gentoo-user] Test for X from cli

[dg]

On Tuesday 01 August 2006 23:20, John J. Foster wrote:
> Good afternoon,
>
> In a bash script, how can I test whether the script itself is being
> run from a virtual terminal, or from an emulator like konsole within X?
>
> Thanks,
> festus

Hi,

One possible solution would be to check the value of $TERM variable... If it 
is 'xterm' then you're probably in the X terminal emulator.

BR,
dmitri
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Re: [gentoo-user] Test for X from cli

[Uwe Thiem]

On 01 August 2006 20:20, John J. Foster wrote:
> Good afternoon,
>
> In a bash script, how can I test whether the script itself is being
> run from a virtual terminal, or from an emulator like konsole within X?

See this script by the name "strangename":

#! /bin/sh

ps ax | grep strangename


If run in a terminal under X it will output something like:#
20516 pts/3    R+     0:00 grep strangename

Please note the "pts".

Run from a virtual text terminal, that will be something like "tty4". 

Instead of actually displaying the output, you can analyse it within your 
script.

Uwe

-- 
Mark Twain: I rather decline two drinks than a German adjective.
http://www.SysEx.com.na
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Re: [gentoo-user] Test for X from cli

[Philip Webb]

060801 John J. Foster wrote:
> In a bash script, how can I test whether the script itself is being run
> from a virtual terminal, or from an emulator like konsole within X?

'echo $DISPLAY' returns ':0' from Konsole,
but nothing from a raw terminal called up via  Ctl-Alt-F2 .

-- 
========================,,============================================
SUPPORT     ___________//___,  Philip Webb : purslow@chass.utoronto.ca
ELECTRIC   /] [] [] [] [] []|  Centre for Urban & Community Studies
TRANSIT    `-O----------O---'  University of Toronto
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Re: [gentoo-user] Test for X from cli

[Alex Schuster]

John writes:

> In a bash script, how can I test whether the script itself is being
> run from a virtual terminal, or from an emulator like konsole within X?

You can check the existance of the DISPLAY environment variable:

if [[ $DISPLAY ]]
then
        echo "We're running under X"
else
        echo "No X running."
fi


        Alex
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Re: [gentoo-user] Test for X from cli

[Rick van Hattem]

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On Tuesday 01 August 2006 21:41, Uwe Thiem wrote:
> On 01 August 2006 20:20, John J. Foster wrote:
> > Good afternoon,
> >
> > In a bash script, how can I test whether the script itself is being
> > run from a virtual terminal, or from an emulator like konsole within X?
>
> See this script by the name "strangename":
>
> #! /bin/sh
>
> ps ax | grep strangename
>
>
> If run in a terminal under X it will output something like:#
> 20516 pts/3    R+     0:00 grep strangename
>
> Please note the "pts".
>
> Run from a virtual text terminal, that will be something like "tty4".
>
> Instead of actually displaying the output, you can analyse it within your
> script.
>
> Uwe
>
> --
> Mark Twain: I rather decline two drinks than a German adjective.
> http://www.SysEx.com.na
I'd look at the TTY variable instead of using ps :)

And as Philip said, to see wheter it is being run from X (with screen you also 
have a pts instead of a tty) you can usually use the DISPLAY variable.

-- 
Rick van Hattem	Rick.van.Hattem(at)Fawo.nl

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Re: [gentoo-user] Test for X from cli

[Jesús Guerrero]

El Martes, 1 de Agosto de 2006 21:20, John J. Foster escribió:
> Good afternoon,
>
> In a bash script, how can I test whether the script itself is being
> run from a virtual terminal, or from an emulator like konsole within X?
>
> Thanks,
> festus

If you need more concrete info, $TERM is also your friend.

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Re: [gentoo-user] Test for X from cli

[John J. Foster]

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On Tue, Aug 01, 2006 at 03:43:12PM -0400, Philip Webb wrote:
> 060801 John J. Foster wrote:
> > In a bash script, how can I test whether the script itself is being run
> > from a virtual terminal, or from an emulator like konsole within X?
> 
> 'echo $DISPLAY' returns ':0' from Konsole,
> but nothing from a raw terminal called up via  Ctl-Alt-F2 .
> 
Of the different methods suggested, I like this one best.

Thanks to all who replied,
festus
-- 
Ambition is a poor excuse for not having enough sense to be lazy.

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Re: [gentoo-user] Test for X from cli

[John J. Foster]

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On Tue, Aug 01, 2006 at 11:37:17PM +0400, dg wrote:
> On Tuesday 01 August 2006 23:20, John J. Foster wrote:
> 
> One possible solution would be to check the value of $TERM variable... If it 
> is 'xterm' then you're probably in the X terminal emulator.

"probably" is not good ;-)
-- 
Ambition is a poor excuse for not having enough sense to be lazy.

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Re: [gentoo-user] Test for X from cli

[Donnie Berkholz]

John J. Foster wrote:
> On Tue, Aug 01, 2006 at 03:43:12PM -0400, Philip Webb wrote:
>> 060801 John J. Foster wrote:
>>> In a bash script, how can I test whether the script itself is being run
>>> from a virtual terminal, or from an emulator like konsole within X?
>> 'echo $DISPLAY' returns ':0' from Konsole,
>> but nothing from a raw terminal called up via  Ctl-Alt-F2 .
>>
> Of the different methods suggested, I like this one best.

This will also be set in ssh sessions with X forwarding turned on. You 
might want to check whether you're in one of those as well.

Thanks,
Donnie
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Re: [gentoo-user] Test for X from cli

[Daniel Iliev]

John J. Foster wrote:
> Good afternoon,
> 
> In a bash script, how can I test whether the script itself is being
> run from a virtual terminal, or from an emulator like konsole within X?
> 
> Thanks,
> festus

Hello,

Here is yet another approach.
So I would use the command "tty".

========
danny@localhost ~ $ whatis tty
tty (1) - print the file name of the terminal connected to standard input
========

So the check could look something like this:

#!/bin/sh
for ttyX in /dev/tty*;
do
[ "`tty`" == "$ttyX" ] && { echo "no X" ; break ; }
echo "X section"
done



-- 
Best regards,
Daniel

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