[UPDATE: Since publishing, I've simplified these instructions and reduced the latency in bringing up the screenshot tool by about half.]

macOS ships with a pretty rad Screenshot app, except that one thing about it totally sucks: it can be configured to either copy screenshots to the clipboard or save them to files, but not both.

Well, I finally got off my ass and cooked up a way to have my save and copy it, too. Read on if you're interested.

First, a refresher. I've always used Command-Shift-4 to take screenshots on the Mac. If you haven't used this method, it works like this:

1. Press Command-Shift-4 anywhere in the system when your subject is composed properly
2. Then do either of these to actually take the screenshot:
   • Drag the mouse to select the region of the screen you want to capture, then release the mouse
   • Hit Space to switch to window selection mode and click on the window you want to capture

When you bring up the Screenshot app (either by opening it in /Applications/Utilities or by pressing Command-Shift-5), you'll see that the "Save to" option forces you to choose between either saving to a particular file destination or copying the screenshot to the clipboard:

Whatever you choose is "sticky" and will apply to all future screenshots until you change it again. If you're smarter than I am, you could set this to a location like Desktop, then rewire your brain to know to press Command-Shift-4 when you want the screenshot saved to a file and instead press Command-Shift-Control-4 when you want it copied to the clipboard. I'm too lazy to teach myself to remember the latter.

Besides, why not both?

So here's what you can do to work around this, at a high level:

1. Un-assign Screenshot.app's Command-Shift-4 keyboard shortcut
2. Write a shell script that relies on Apple's screencapture and osascript commands
3. Create a Shortcut that runs the shell script
4. Assign Command-Shift-4 to our new Shortcut

First, we need to disable the existing global shortcut for taking interactive screenshots. To do this, open System Settings, scroll to Keyboard in the left sidebar, then click the Keyboard Shortcuts button. This will bring up a modal window—click its Screenshots section.

Uncheck "Save picture of selected area as a file":

With the system default keyboard shortcut disabled, we can now create our own.

Next, we need to write a bash script to save and copy screenshots. Here's mine. It lives in a directory I created in my home directory (~/bin/screenshot), but it can reside anywhere you like:

#!/usr/bin/env bash
# Usage:
#
#   $ screenshot
#
# Then, either:
#   - drag and release the mouse to select an area to screenshot
#   - press spacebar and click the mouse to select the current window
# Construct a unique-ish filename like:
# ~/Desktop/screenshot-2024-03-16-16h43m48s.png
isoTime=$(date +"%Y-%m-%d-%Hh%Mm%Ss")
fileName="$HOME/Desktop/screenshot-$isoTime.png"
# The -i will put the Screenshot app into interactive mode (like cmd-shift-4)
screencapture -i "$fileName"
if [ -f "$fileName" ]; then
  # This gnarly "«class PNGf»" incantation is for some reason necessary to copy the file
  osascript -e "set the clipboard to (read (POSIX file \"${fileName}\") as «class PNGf»)"
fi

Open the Shortcuts app, then:

1. Create a new Shortcut (I named mine "Better Screenshot")
2. Add the "Run Shell Script" action
3. Type a valid location pointing to your script (~/bin/screenshot in my case)

Finally, on the same screen, click the i (info) icon at the top of the right sidebar, then click the Add Keyboard Shortcut button and press Command-Shift-4, (which will read as Cmd-Shift-$) and press return to confirm:

After you do all this, the first couple times you actually use the new Shortcut, it may ask for permissions for either bash or Shortcuts itself to record the screen and access your documents folder, and you'll need to do the "Quit & Reopen" dance after turning those on.

So there we are. Clear as mud. I'm happy to report that this all works, but there's a ~150ms delay before the interactive crosshair appears, which sucks.

If you want to transfer this approach to your other Macs, it shouldn't be too hard. Because Shortcuts sync via iCloud, you just need to copy your shell script (which I do via searls/icloud-dotfiles), and then repeat the keyboard shortcut setup steps.

Lemme know if you have any compliments, questions, or suggestions to improve on this. 💜