Is there a way to lock/unlock the screen from a script?
The answer is “yes”. Lock the screen:
Unlock the screen:
Demo (lock the screen, then unlock it in 5 seconds):
gnome-screensaver-command -l && sleep 5 && gnome-screensaver-command -d
Tip from here.
Under Gnome/Unity, you want to increase the number of virtual workspaces.
Start CompizConfig Settings Manager (
ccsm), then General -> General Options -> Desktop Size tab. Here adjust the horizontal and vertical virtual size.
The title of this post is a reference to a novel of Harry Harrison.
You browse the web and you find a nice image file. “Hey, it’d look cool on my desktop!” Or, you browse your local image files: “Hey, I want to see it as my wallpaper!” How to set a background image painlessly?
With jabbapylib, of course :) Just use my new little script:
# the image is on the web: set_wallpaper http://i.imgur.com/t1FRG.jpg # the image is a local file: set_wallpaper sunshine.png
Under Gnome you could set the wallpaper from command line with the following commands:
gconftool-2 --type=string --set /desktop/gnome/background/picture_filename /path/to/image.jpg gconftool-2 --type=string --set /desktop/gnome/background/picture_options stretched # stretch the image
You try it again on a newer Ubuntu that uses Unity, and nothing happens! What’s going on?
The new way of setting a wallpaper is this:
gsettings set org.gnome.desktop.background picture-uri file:///path/to/img.jpg
Notice that you must provide a URI, hence the “
The first snippet works with Gnome 2. The second one is for Gnome 3. To figure out your Gnome version, launch the command “
Update (20110915): The project has changed a lot since its first release, thus the original post here got completely outdated. I rewrote this blog entry to reflect the current state of the project.
The goal of this project is twofold. First, download images from a wallpaper site. Second, rotate the downloaded images as wallpapers.
Here is the list of changes that I added to the original version:
- New! XML support is dropped. For setting the images as wallpapers, use the script
- New! Support for 4walled.org is added!
- New! Support for wallbase.cc is added!
- Large images can be resized to fit your screen resolution. By default, the maximum width of images can be 1920 pixels. You can customize it in the config file. It’s recommended, this way the images will occupy much less space on your hard drive.
- You can specify several categories and the downloader will grab images from all these sites. The same is true for rotator: you can specify several categories and it will pick a random image from the whole list. See the config file for more details.
- The project includes an automatic wallpaper changer script called
02_wallpaper_rotator.py. You don’t need any third-party managers anymore.
- You can choose from several categories. You can also specify your favorite category.
- Screen scraping is done with the BeautifulSoup library.
- The most important change is the filtering of images that are unsuitable as wallpapers, i.e. small images, portrait images, and images with strange ratio are removed from the list.
- Support for Flickr images (zioyero’s patch).
- The URLs of the downloaded images are strored in an SQLite database. This way an already fetched image (either good or bad) won’t be downloaded again.
Supported wallpaper sites
First, you might want to customize some settings in the
config.py file. The most important thing is the
PHOTO_DIR directory, i.e. where to store the downloaded images. Create this directory if it doesn’t exist. Then, simply launch the script:
You can also add it to your crontab:
$ crontab -e 10 */2 * * * /absolute_path_to/01_wallpaper_downloader.py
Add the second line to the end of the crontab list. Here the script is called at every two hours (at 0h10, 2h10, etc.).
For setting the images as wallpapers:
That is, just launch it in the background. It uses the same config file as the wallpaper downloader. I put it among my startup applications, thus it starts automatically.
You can download the script from https://github.com/jabbalaci/Wallpaper-Downloader-and-Rotator-for-Gnome.
You have a bunch of nice wallpaper images that you would like to see on your Desktop. You want Gnome to rotate them in a circular way. Also, specify the duration of an image and the transition between two images.
You need to create an XML file similar to this:
<?xml version='1.0'?> <background> <starttime> <hour>00</hour> <minute>00</minute> <second>01</second> </starttime> <static> <duration>10.0</duration> <file>/trash/wallpapers/A.jpg</file> </static> <transition> <duration>5.0</duration> <from>/trash/wallpapers/A.jpg</from> <to>/trash/wallpapers/B.jpg</to> </transition> <static> <duration>10.0</duration> <file>/trash/wallpapers/B.jpg</file> </static> <transition> <duration>5.0</duration> <from>/trash/wallpapers/B.jpg</from> <to>/trash/wallpapers/C.jpg</to> </transition> <static> <duration>10.0</duration> <file>/trash/wallpapers/C.jpg</file> </static> <transition> <duration>5.0</duration> <from>/trash/wallpapers/C.jpg</from> <to>/trash/wallpapers/A.jpg</to> </transition> </background>
Here, I rotate three images. One image is shown for 10 seconds and the transition is done smoothly in 5 seconds. After the third image, the first image is shown again, i.e. Gnome will restart processing the file from the beginning.
Usage: You will have to specify this XML file as your background. Right click on the Desktop, Change Desktop Background, Background tab, Add… button. In the bottom right hand corner, switch from Images to All files, then select the XML file. See this screenshot.
Note: Once you set the XML file as your background, you can update it. Gnome will notice the changes and the file will be reloaded. That is, you don’t need to set the file as your background after each modification.
- Creating a rotating wallpaper “stack” for your Ubuntu 10.04 (and other Gnome 2.28) system
- Generating Gnome Rotating Backgrounds