Does anybody know where's the .htacess file situated once i install in linux red-colored hat 5?

Thanks!

There's numberhtaccess file that's installed. You'll have a global config apply for Apache, that is in /etc/httpd/conf/httpd.conf on RedHat (see http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/4/html/Reference_Guide/s1-apache-config.html). However, .htaccess files are something you create on the per-directory basis in which the actual web files live.