M-x grep gets /dev/null automatically appended to the command

[Francis Moreau]

Hello,

I have customized my grep-command variable this way:

(setq grep-command "git --no-pager grep -n -e ")

because I'm working in a git repo.

But when I start the grep command (M-x grep), emacs appends
'/dev/null' to the git command:

git --no-pager grep -n -e seq /dev/null

Can anybody tell my what I'm doing wrong ?

thanks
-- 
Francis