`pbcopy` and `pbpaste` are one of my most-loved in the list.
Dealing with some minified json, switching to iTerm, doing `pbpaste | json_pp | pbcopy` and having a clean output is _so_ nice.
replies(28):
Now, for your Mac example — if that's a specific pipeline you often use, you can write a Service menu entry to do it in place, without switching to a terminal.