voila la resultat :

admin@GRR:~$ ps aux | grep 'httpd|apache'
admin 2280 0.0 0.3 3316 704 pts/0 S+ 10:48 0:00 grep httpd|apache


admin@GRR:~$ grep -iE '(user|group) ' /opt/lampp/etc/httpd.conf
# If you wish httpd to run as a different user or group, you must run
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
User nobody
Group nogroup
# User home directories
admin@GRR:~$