Hi, Britton.

> This seems to work nicely to do something I've wanted for a while.
> I have to admit I don't quite see why it works.  What's giving us
> the new window rather than just dumping the info command output
> into the current buffer as :r! says?  This command by itself:
>
>   :execute "r!info --subnodes --output - gcc"
>
> puts its output in the current buffer, what part of the function
> and command wrapping layers is changing this?

The command is simple.

We can use the following command to dump all gcc info in terminal.
Host> info --subnodes --output - gcc

And r!{cmd} is used to "read the Execute {cmd} and insert its standard
output below the cursor or the specified line."

Best Regards,
  robert

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