Or add a REPL method/command:
In .pryrc:
```
Pry::Commands.block_command "cp", "Copy last command to clipboard" do
IO.popen("pbcopy", "w") { |cb| cb.write(pry_instance.input_array.last) }
end
```
In .irbrc:
```
def cp
IO.popen("pbcopy", "w") { |cb| cb.write(Reline::HISTORY[-2]) }
end
```