Get osx screencapture terminal tool to capture both screens

Question

The screencapture terminal app is perfect and takes a screenshot just like you would expect, but it does only take a screenshot of the main window if you have two screens connected.

screencapture screenshot.png

But if you do CMD + Shift + 3 it takes both screens and saves them as two screenshots.

The man page has a parameter -m, which says Only capture the main monitor, but as you can see i do not use that parameter and you would then assume it would take of both screens, but no.

https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/screencapture.1.html

How can i make screencapture take both screen or program it to take a screenshot of the second screen?

Answer 1

Found the solution 3 minutes later, but thought I would share the information since others would properly need it also :)

If you have multiple screens you will have to pass more file names, so if you have two screens you would do:

screencapture screen1.png screen2.png

The functionality is hidden is this message if you read carefully!

files   where to save the screen capture, 1 file per screen

Answer 2

This script works:

while [ 1 ]; do 
  date=$(date "+%Y%m%dT%H%M%S")
  screencapture -x -D 1 ~/Desktop/"screen_${date}.png"
  sleep 2
 
  date=$(date "+%Y%m%dT%H%M%S")
  screencapture -x -D 2 ~/Desktop/"screen_${date}.png"
  sleep 2
done

The -D 1 and -D 2 command refer to the monitors connected