Share the clipboards automatically when using Apple Screen Sharing

Apple answer: https://support.apple.com/kb/PH14152

Choose Edit >Use Shared Clipboard. Using the shared clipboard, you can:

Copy text and images from documents on one Mac and paste them into documents on the other.

Select and drag text and images from one Mac to the other.

Copy a link from your web browser and paste it into a web browser on the other Mac.

Copy text from a document on one Mac and drop it on the desktop of the other Mac to create a clipping.

There is a very cool command line utility called cscreen. The developer has a number of versions available. Depending on how old your Mac is, you either want the PPC version, or the Intel version. If your Mac is newer than a 2006 model, you probably want the Intel version.

Once you have downloaded the disk image, double click the image to mount it, then copy the cscreen file to anywhere except the disk image. Now open Terminal. (You can search for it in Spotlight.) Once Terminal is open, you can run cscreen by navigating to it, then typing ./cscreen. For example, if you copied cscreen to your Desktop, you would navigate to the Desktop in Terminal by typing cd ~/Desktop. Once there, you would type ./cscreen.

To change the resolution, we first need to know what resolutions are possible. To find out, we can type ./cscreen -v. This should output something like this:

Now we can choose a resolution. Assuming you want 32 bit colour depth, you can change to the resolution of your choice by typing

cscreen -i <DisplayID> -d 32 -x <width> -y <height>,

and replacing the parts enclosed in <> with the actual values. I haven't tested this with a headless system over VNC, so your milage may vary. The command line option -i <DisplayID> is optional, so if your VNC doesn't register a display ID you may still be able to change the resolution if you omit that part of the command.