How can I automatically execute normal mode keystrokes with a terminal command when opening Vim?

Question

How do I run vim with file.txt and screen center at line 100? Basically I would like to use zz mapping when starting Vim.

This does not work: vim -c "zz" file.txt +100

Answer 1

zz is a normal mode command, so use :normal:

vim "+normal zz" file.txt +100
vim -c "normal zz" file.txt +100

Answer 2

Another option would be to run multiple commands in one line

vim README.md +"56;norm zz"