How to block login to certain operating systems?

Question

htaccess

Is there any rule for blocking users from linux from entering the site? Tried the rule below but the site goes into a 500 error.

BrowserMatchNoCase Macintosh bad_os
BrowserMatchNoCase Linux bad_os
Order Deny, Allow
Deny from env=bad_os

Answer 1

Order Deny, Allow

There must be no spaces after the comma
Order Deny,Allow