I would like to find a combination of keys to clear the contents of the clipboard or better yet an application that can configure a timer to clear it automatically one minute after last paste operation.
Yes, you have a choice of three built in methods for clearing the clipboard.
AppleScript/Automator are two simple methods for programmatically manipulating the clipboard.
Here's a little script that does what you want.
Also, Automator allows the same. You'll need to define a variable, double click on the name text to set it to null, and then drag in the set clipboard action before running / saving it. The benefit of using automator is that you can assign it as a service and then use system keyboard shortcuts to call it.
For AppleScript or one of the nice terminal answers here that use
To set a combination of keys to clear the clipboard, you can create a Service using Automator.
Your service will have a single action, Run Shell Script
The shell script you will use is this:
Then save the service and assign it a keystroke using System Preferences » Keyboard » Keyboard Shortcuts » Services.
The challenge of an application that automatically clears the clipboard one minute after the last paste operation is that said application would have to monitor all the copy and paste events across all applications; presumably you would want the action cancelled if you pasted and then copied new text (you wouldn't want to clear the new content from the clipboard one minute after the last paste of the previous clipboard contents). Such a program could be written, but implementing it with AppleScript or Automator would be a challenge.
This terminal command replaces the clipboard with an empty string:
You could put this in a script, then use