How to set primary monitor and relation between monitors on ubuntu using terminal?

Question

In my Ubuntu there were an applet responsible for monitors management. Unfortunately after some updates (I didn't notice when exactly) this applet disappeared from "System Settings" applet. I wonder if there is any command line tool which manages monitors' properties. For example I want to change primary monitor from current one to another and to change orientation between them (which is left or which is right).

Solution

I figured it out. The command line tool is xrandr. The first step is to print all screens in the system by executing command:

xrandr

Next, when we know what the names are, we can adjust settings, in my case it was something like that:

xrandr --output DVI-I-1 --primary --right-of VGA-1

It set DVI-I-1 as primary monitor and 'moved' it on the right side of VGA-1 monitor.

Comments

[Dave]

I get awk: cmd. line:1: /1:{print } awk: cmd. line:1: ^ unterminated regexp when attempting this.

[stryder9k]

/1: is not needed. This should work, xrandr --output $(xrandr --listactivemonitors | awk '{print $4}') --primary