command line - How to write bash script to open vi and edit document?

i'd write bash script automates process:

vi filename.pdf (open "filename.pdf" using vi)

:4,7d (in vi command mode, delete lines 4-7)

o (in vi command mode, tap shift+o (captial oh) create new line)

<<>> (in vi insert mode, type 2 lesser-thans , 2 greater-thans)

esc (switch vi command mode)

:wq (in vi command mode, save file , quit vi)

echo "complete."

you might want use ed (which designed automate scripting)

ed < edit.sed filename.pdf

where edit.sed is:

4,7d <<>> . w q

this insert <<>> in fifth line.

Primitatvve