Command line utility to create screenshot Is there some command line utility to create a screenshot of the my screen and store it as png? (Preferably one in the system, without need to install anything new)
It sounds like you're looking for the command screencapture, which, according to its man page, is to "capture images from the screen and save them to a file or the clipboard".

It's been a standard part of OS X since 10.2.