Getting and setting screen size for Xorg

Question

I would like to run a command like get-screen-resolution during a X session to get a '800x480' output. ( or whatever the actual screen size is ).

Is there something available for this? Currently I take a screenshot and measure the resulting *.jpg's width & height attributes.

Also, how do I set the screensize during a X session from the command-line?

Answer 1

You can use xrandr to do both

Get resolution

$ xrandr
Screen 0: minimum 320 x 240, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm

Set resolution

$ xrandr --output default --mode 1280x1024

Answer 2

From my personal shell library:

get_screen_size()
{
    xdpyinfo | awk '/dimensions:/ { print $2; exit }'
}

Answer 3

Clean xrandr output for imagemagick use

The following line takes the output of xrandr and cleans it with awk for use with imagemagick:

$ xrandr |awk '$0 ~ "*" {print $1}'

1366x768