General :: ImageMagick's "import" Command Line Program Failing To Take A Screenshot From CRON Script
Feb 16, 2011
I wrote a simple command line script which is suppose to take my screenshot every 5 minutes.(using ImageMagick's "import" program)
Here is the script (shottr.sh):
This is working fine if I execute by hand i.e:
The script itself is being executed (I hear a voice saying: "Screenshot") but the actual screenshot is not taken.
Be assured that it is NOT permission issue (I placed a simple "touch" invocation and file was created)
May be if it's run from cron...it doesn't have a "window" so it can't take a screenshot from nowhere? If that is the case, then how can I workaround it?
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Jun 3, 2010
To take a screenshot(or partial screenshot), I use to use the command-line, type "import <filename>.png" and then "alt-tab" away from the console (for me, xterm) and then (usually) select a part of the webpage showing up on the browser. However, I find in my modern X-window installations (I use osuse and slackware, with several window managers: xfce, icewm and awesome) the alt-tabbing bit doesn't work any more.To get by, I have to reduce the size of the console so that the bit I want to capture is visible as I write the import commandI figure this is an X problem, but it could also be an imagemagick problem (on that subject, I think I'm going to try out graphicsmagick soon)
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Jan 24, 2011
I use a program which makes a large image which I have to scroll to view. The program has no way to save the image, and I have no access to the source to modify it. The only way I have to get the image from the program is by screenshot. My goal is to save the full size image without having to piece together individual screenshots. I'm using this script to try taking a screenshot:
#!/bin/bash
window=$(wmctrl -l | grep "Program$" | awk '{print $1}')
wmctrl -v -i -r $window -e '0,0,0,6030,5828'
wmctrl -i -a $window
import -window $window ~/Desktop/screenshot.png
This uses wmctrl to get the window id ($window) for a window named "Program". It then tries to resize the window to the desired dimensions. It uses imagemagick (import) to save a screenshot.png on the user's Desktop. All of this works except the resize step. I can resize the window using wmctrl -r -e, but sizes greater than the screen size don't work. I'm using Ubuntu 10.04 and the Gnome Desktop. I run two monitors, but I've tried this with one of them disabled. Is there a way to resize the window larger than my screen to get a huge screenshot?
Part II: I tried using xrandr to set up screen panning, so as to have a bigger desktop than my monitor. xrandr --output LVDS --panning 2600x2500 This command makes the laptop screen pan over a 2600x2500 size desktop, even though it can only show 1440x900 at one time. To turn off the panning, I can use a similar command to set total size and with zeroes for the panning section. This gives me back my original laptop display behavior. xrandr --fb 1440x900 --output LVDS --panning 0x0 This is all done with xrandr, and does not require any Xorg.conf changes (my Ubuntu system doesn't even have an Xorg.conf).
My video card seems to only allow about 6.5 million pixels, even though the maximum dimensions are 8192x8192. That maximum seems to be the maximum for either dimension, but there is a limit to how many pixels can be drawn, which is the width multiplied by the height. Once I did the screen resize, I tried my script again and got a screenshot. The screenshot however is totally scrambled. I'm not sure if it's unable to take a screenshot of an off-screen window or if it is unable to handle the large dimensions of the window. With the panning display, the window should think it is visible, and the window manager should think it is on-screen. So there is a pixel buffer somewhere with those pixels in it, so there should be a way to get a screenshot.
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Mar 16, 2010
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Feb 18, 2010
so i have a few shell scripts that execute wonderfully when i type them at the command line but they fail when they are run from cron.
for example, if i run a script from command line that contains
Code:
shopt -s nullglob
to prevent problems with for f in *.mp4 type loops, it works fine from terminal command line but when called from cron, it gives an error->
Code:
/home/centralsqwall/Videos/videochecker.sh: 91: shopt: not found
a couple other random errors as well...
so there is some difference in the shell from cron and the terminal?
i'm running ubuntu 9.10, #!/bin/bash
what are the commands i should be using to echo my environment or simulate cron environment from the terminal?
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May 1, 2010
simple scan error as follows: Failed to save file ImageMagick returned error code 11 Command line: convert -adjoin /tmp/simple-scan-DA9MBV.jpg /tmp/simple-scan-XCK4BV.jpg /tmp/simple-scan-NZVYBV.pdf Stdout: Stderr: using karmic note: I have apparmor extra profiles installed but didn't notice one that related to simple scan or imagemagick. Red herring or not?
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Jun 16, 2010
How can I see all my installed program in Ubuntu from command line?
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May 31, 2010
I have the following shell:
export PATH=/u01/app/oracle/product/10.2.0/db_2/bin:/usr/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin
ftp -u -v -n -i > /bk01/exports/FTP_OUTPUT.LOG <<EOF
open 197.0.0.78
user orabackup orabackup
cd /media/disco/BK_Oracle
bin
put FILE00001.LOG
put FILE00001.DMP
quit
EOF
Executing the shell from command line, the output is:
Connected to 197.0.0.78.
220 Bienvenido al servicio FTP del servidor backup.
530 Please login with USER and PASS.
530 Please login with USER and PASS.
331 Please specify the password.
230 Login successful.
250 Directory successfully changed.
200 Switching to Binary mode.
local: EXPO_APOT10G_20100531.LOG remote: EXPO_APOT10G_20100531.LOG 227 Entering Passive Mode (197,0,0,78,200,162) 150 Ok to send data. 226 File receive OK. 127498 bytes sent in 0.0022 seconds (5.7e+04 Kbytes/s)
local: EXPO_APOT10G_20100531.DMP remote: EXPO_APOT10G_20100531.DMP
227 Entering Passive Mode (197,0,0,78,175,141) 150 Ok to send data. 226 File receive OK. 458190848 bytes sent in 6.1 seconds (7.3e+04 Kbytes/s)
221 Goodbye.
Executing the shell from cron, the output is:
Connected to 197.0.0.78 (197.0.0.7.
220 Bienvenido al servicio FTP del servidor backup.
331 Please specify the password.
230 Login successful.
250 Directory successfully changed.
200 Switching to Binary mode.
local: EXPO_APOT10G_20100531.LOG remote: EXPO_APOT10G_20100531.LOG
local: EXPO_APOT10G_20100531.DMP remote: EXPO_APOT10G_20100531.DMP
221 Goodbye.
Why from cron the output no show the statistics in red ...?
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I tried:
I wasn't able to use the $i in the filename, and without it the command gave me no errors, but did nothing else either. I know the Unix command line is very powerful, and I have a feeling that this should be possible, but I just don't know how to do it.
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Directory /path/to is mounted over NFS (same network). Some options of fstab that might be helpful:
Both rsize and wsize are 3kB
hard,proto=tcp,timeo=600,retrans=2
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Are there any thoughts what may be wrong with my photo-processing setup?
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[Code]...
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