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Automatically capturing screenshots

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  Automatically capturing screenshots "V. Dorokhin" <vdor@nyet.net> - 2019-09-04 21:04 +0000
    Re: Automatically capturing screenshots John McCue <jmccue@jmclin1.hsd1.ma.comcast.net> - 2019-09-04 21:59 +0000
    Re: Automatically capturing screenshots Aragorn <thorongil@telenet.be> - 2019-09-05 00:14 +0200
    Re: Automatically capturing screenshots marrgol <marrgol@address.invalid> - 2019-09-05 01:07 +0200
    Re: Automatically capturing screenshots "V. Dorokhin" <vdor@nyet.net> - 2019-09-05 13:53 +0000
      Re: Automatically capturing screenshots John McCue <jmccue@jmclin1.hsd1.ma.comcast.net> - 2019-09-06 00:44 +0000
        Re: Automatically capturing screenshots "V. Dorokhin" <vdor@nyet.net> - 2019-09-06 15:02 +0000
    Re: Automatically capturing screenshots Andreas Kohlbach <ank@spamfence.net> - 2019-09-05 13:24 -0400

#28093 — Automatically capturing screenshots

	I have an Xfce desktop with a number (8, actually) different 
workspaces. Every so often I would like to capture and save a screenshot 
of each of the workspaces. I know how to do this by hand, but I would 
like to put together a shell-script to do it for me, so that I could 
invoke it automatically from cron.

	I have no clue how this can be done. If anybody does, I would be 
most grateful to learn how.

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#28096

V. Dorokhin <vdor@nyet.net> wrote:
>         I have an Xfce desktop with a number (8, actually) different 
> workspaces. Every so often I would like to capture and save a screenshot 
> of each of the workspaces. I know how to do this by hand, but I would 
> like to put together a shell-script to do it for me, so that I could 
> invoke it automatically from cron.
> 
>         I have no clue how this can be done. If anybody does, I would be 
> most grateful to learn how.

I doubt it can be done, maybe as root you can read
/dev/*mem*, but I doubt that is possible these days.
IIRC, a long time ago, I thought there was a device
/dev/kmem(?) that could be ready by root.

John

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#28097

On 04.09.2019 at 21:04, V. Dorokhin scribbled:

> 	I have an Xfce desktop with a number (8, actually) different 
> workspaces. Every so often I would like to capture and save a
> screenshot of each of the workspaces. I know how to do this by hand,
> but I would like to put together a shell-script to do it for me, so
> that I could invoke it automatically from cron.
> 
> 	I have no clue how this can be done. If anybody does, I would
> be most grateful to learn how.

Install xorg-xwd.  It's a command-line utility for making screenshots.


-- 
With respect,
= Aragorn =

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#28100

On 2019-09-04 at 23:04, V. Dorokhin wrote:
> 	I have an Xfce desktop with a number (8, actually) different 
> workspaces. Every so often I would like to capture and save a screenshot 
> of each of the workspaces. I know how to do this by hand, but I would 
> like to put together a shell-script to do it for me, so that I could 
> invoke it automatically from cron.
> 
> 	I have no clue how this can be done. If anybody does, I would be 
> most grateful to learn how.

I don’t know if this can be done without switching desktops
but if you don’t mind such "visual disturbance" you can certainly
automate it using 'xdotool' and 'xfce4-screenshooter'.  You could
build around something like this:

xdotool set_desktop 2
xfce4-screenshooter -f -s /path/to/screenshots/ & xdotool sleep 1\
type 'desktop_2_screenshot' ; xdotool key alt+s


-- 
mrg

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#28120

On Wed, 04 Sep 2019 21:04:32 +0000, V. Dorokhin wrote:

> I have an Xfce desktop with a number (8, actually) different workspaces.
> Every so often I would like to capture and save a screenshot of each of
> the workspaces. I know how to do this by hand, but I would like to put
> together a shell-script to do it for me, so that I could invoke it
> automatically from cron.
> 
> 	I have no clue how this can be done. If anybody does, I would be
> most grateful to learn how.

	I got this working with a combination of xdotool and scrot - 
xfce4-screenshooter insists in prompting for confirmation on where to 
save the screenshot file, which will necessitate human intervention. 
Anyway, the following little script does it for me:

#! /bin/sh

export DISPLAY=localhost:0.0

WORKSPACES=8
CURRENT=`xdotool get_desktop`
COUNT=0

while [ $COUNT -lt $WORKSPACES ]; do
  FILENAME=`date +'%Y%m%d%H%M%S'`_$COUNT.jpg
  xdotool set_desktop $COUNT
  scrot -q 100 -d 1 /tmp/$FILENAME
  COUNT=$(($COUNT + 1))
done

xdotool set_desktop $CURRENT

Provided that your desktop is running, this works even when invoked by 
the cron daemon. It will be somewhat annoying if it is invoked when you 
are at your desktop, but at least you end up in the same workspace that 
you originally were.

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#28124

V. Dorokhin <vdor@nyet.net> wrote:
> On Wed, 04 Sep 2019 21:04:32 +0000, V. Dorokhin wrote:
> 
<snip>
> 
>         I got this working with a combination of xdotool and scrot - 

never heard of xdotool

<snip>
> 
> Provided that your desktop is running, this works even when invoked by 
> the cron daemon. 

Nice, I did not think it was possible via cron,
will play with the script when I have time :)

John

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#28126

On Fri, 06 Sep 2019 00:44:34 +0000, John McCue wrote:

> V. Dorokhin <vdor@nyet.net> wrote:
>> On Wed, 04 Sep 2019 21:04:32 +0000, V. Dorokhin wrote:
>> 
> <snip>
>> 
>>         I got this working with a combination of xdotool and scrot -
> 
> never heard of xdotool
> 
> <snip>
>> 
>> Provided that your desktop is running, this works even when invoked by
>> the cron daemon.
> 
> Nice, I did not think it was possible via cron,
> will play with the script when I have time :)
> 
> John

	Bear in mind that, in order to get it to work from crontab at any 
time, I had to make sure to disable the Xfce screensaver, and the screen 
blanking feature built into X:

	xset -dpms
	xset s noblank
	xset s off

Otherwise, I would just get blank snapshots.

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#28122

On Wed, 4 Sep 2019 21:04:32 +0000 (UTC), V. Dorokhin wrote:
>
> 	I have an Xfce desktop with a number (8, actually) different 
> workspaces. Every so often I would like to capture and save a screenshot 
> of each of the workspaces. I know how to do this by hand, but I would 
> like to put together a shell-script to do it for me, so that I could 
> invoke it automatically from cron.

Am not sure I really understand what you want.

For taking screenshots I usually us import, which is part of
ImageMagick. Checkout the man page <https://linux.die.net/man/1/import>
and see, if any of its vast number of options can do that. I find for
example:

-pause value - seconds delay between snapshots
-frame - include window manager frame
-page - geometry size and location of an image canvas
-screen - select image from root window
-window id - select window with this id or name

May be one could create something with these or other options.

You could probably run one instance on every desktop in an x-term which
you then minimize.
-- 
Andreas

My random thoughts and comments
https://news-commentaries.blogspot.com/

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