Terminal · Run the line

Editing

Windows · Linux

Ctrl+J

Mac

Ctrl+J

Both systems use the same combination.

Runs the line; it sends the very same control character as Enter, so the two are identical.

In a terminal Ctrl+C is not copy; it interrupts whatever is running. Copy is Ctrl+Shift+C in Windows Terminal and Cmd+C on a Mac.

Reading the key names

Keys joined by + are pressed together: Ctrl+Shift+P means hold Ctrl and Shift, then P.
On a Mac, Cmd is ⌘, Option is ⌥ (labelled Alt on some keyboards), Control is ⌃ and Shift is ⇧.
Windows Ctrl usually becomes Cmd on a Mac, but not always — this reference lists both combinations separately.
With a Korean, Japanese or Chinese input method active, shortcuts built on letter keys may not fire. Switch to Latin input and try again.
When a combination does nothing, another program has often claimed it as a global shortcut first.

Q. What is the shortcut for Run the line in Terminal?

Runs the line; it sends the very same control character as Enter, so the two are identical. It is Ctrl+J on Windows and Ctrl+J on a Mac.

Q. Is it the same on Windows and Mac?

Yes, Ctrl+J on both.

Q. How many keys is that?

2 pressed together. The combination sits under Editing in Terminal.