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Comment by robterrell | Hacker News Reader

You've always had this ability, but with more convoluted syntax:

  osascript -e "tell application \"System Events\" to keystroke \"whatever\""

Specify the application too with multiple -e parameters. This will copy whatever is selected in Safari:

  osascript -e "tell application \"Safari\" to activate" -e "tell application \"System Events\" to keystroke \"c\" using {command down}"

How do you stimulate delays, animation intervals, key down/ups a with System Events?

Apple Script is a programming language and you have full control flow at your disposal to wait and branch as needed.

This is too generic to answer this specific question. Key down, for example, is not an inherent property of a programming language.

(and neither is delay precision guarantees, which might be important for some key sequences)

AppleScript supports the "delay" command. System Events supports both "keydown" and "keyup" in addition to keystroke.