[oddeyed]

The opposite. ; is the same as a newline. Prepending the newline with a backslash \ is like saying "pretend this newline isn't here". So all of the -H arguments get applied to the same command in the example, rather than being treated as commands in their own right.

[newswasboring]

Oh... I am having one of those moments where I feel like everyone else but me knew this and I'm a dummy. But when put like this, I realize \ here is an escape character thing, making the newline into \\n.