How can I delete multiple lines in vi?

Question

I have tried to follow the following:

How to delete selected text in VI editor

but

5dd

gives

E492: Not a

Answer 1

If you want to delete a range AFTER a specific line trigger you can use something like this

:g/^TMPDIR/ :.,+11d

That deletes 11 lines (inclusive) after every encounter of ^TMPDIR.