As I said, Terminal's tricky. Many posters here won't even dip a toe into it.

That last line is confusing me: MacBook-Pro:~ $ MacBook-Pro:~ (my name)$ clear

Where did the "clear" come from? Without it it looks like a standard prompt that you'd expect when you terminate a process.

If you search /Applications/Utilities/Activity Monitor for dd, does it come up, i.e. is the process still running?

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire