Taking a screenshot
import
An easy way to take a screenshot of your curent system is using the import command:
import -window root screenshot.jpg
import is part of the imagemagick package.
In case you only want to grab a single window you can use the xwininfo tool to find out it's id. Just run the following command and click into the window you want to take a screenshot of.
import -window `xwininfo |grep 'Window id:' |cut -d" " -f4` screenshot.jpg
If you run twinview or dualhead, simply take the screenshot twice and use imagemagick to paste them together:
import -window root -display :0.0 -screen /tmp/0.png
import -window root -display :0.1 -screen /tmp/1.png
convert +append /tmp/0.png /tmp/1.png screenshot.png
rm /tmp/{0,1}.png
gimp
You also can take screenshots with gimp (File -> Create -> Screenshot...).
xwd
xwd is part of the xorg-apps package.
Take a screenshot of the root window:
xwd -root -out screenshot.xwd
scrot
Scrot, available in the "extra" repository, provides for taking screenshots from the CLI, and offers features such as a user-definable time delay. Unless instructed otherwise, it saves the file in the directory bash was at when the command was launched.
scrot -t 20 -d 5
saves a dated .PNG file, along with a thumbnail (20% of original) for Web posting. It provides a five second delay before capturing, in this instance.
KDE
If you use KDE, you might want to use ksnapshot, which can also be activated using <Prt Scr>.
GNOME
You can press <Prt Scr> or Apps->Accessories->Take Screenshot.
Virtual console
Install a framebuffer and use Template:Package Official to take a screen shot. Another option is to use Template:Package Official, but that tends to corrupt the image by inverting colors.