if $(systemctl -q is-enabled nginx 2> /dev/null) ; then

   NGINX_IS_ENABLED=true

   # - Determin user of the webserver
   # -
   nginx_binary="$(which nginx)"
   if [[ -z "$nginx_binary" ]] ; then
      nginx_binary="$(ps -axu | grep -E "nginx:.*master" | grep -v grep | grep -o -E "\S+/nginx")"
      if [[ -z "$nginx_binary" ]] ; then
         if [[ -x "/usr/local/nginx/bin/nginx" ]]; then
            nginx_binary="/usr/local/nginx/bin/nginx"
         elif [[ -x "/usr/local/nginx/sbin/nginx" ]]; then
            nginx_binary="/usr/local/nginx/sbin/nginx"
         fi
      fi
   fi

   if [[ -x "$nginx_binary" ]] ; then
      _HTTP_USER="$($nginx_binary -T 2> /dev/null | grep -E "^\s*user\s+\S+;" | grep -o -E "\S+;$" | sed -e 's/;$//')"
   fi

   # - Is webserver running ?
   # -
   PID=$(ps aux | grep "$(realpath $nginx_binary)" | grep -e "^root" | grep -v grep | awk '{print$2}')
   if [[ "X${PID}X" = "XX" ]] ;then
      IS_HTTPD_RUNNING=false
   else
      IS_HTTPD_RUNNING=true
   fi


elif $(systemctl -q is-enabled apache2 2> /dev/null) ; then

   APACHE2_IS_ENABLED=true

   # - Determin user of the webserver
   # -
   httpd_binary="`which httpd`"
   if [ -z "$httpd_binary" ]; then
      httpd_binary="$(ps -axu | grep httpd |  grep -e "^root" | grep -v grep | awk '{print$11}')"
      if [ -z "$httpd_binary" ]; then
         if [ -x "/usr/local/apache2/bin/httpd" ]; then
            httpd_binary="/usr/local/apache2/bin/httpd"
         fi
      fi
   fi
   if [ -x "$httpd_binary" ];then

      # - Determin websever user
      # -
      _HTTP_USER="`$httpd_binary -t -D DUMP_RUN_CFG | grep -i -e "^User" | awk '{print$2}' | cut -d\"=\" -f2 | tr -d '"'`"
      _HTTP_GROUP="`$httpd_binary -t -D DUMP_RUN_CFG | grep -i -e "^Group" | awk '{print$2}' | cut -d\"=\" -f2 | tr -d '"'`"

      # - Is webserver running ?
      # -
      PID=$(ps aux | grep "$(realpath $httpd_binary)" | grep -e "^root" | grep -v grep | awk '{print$2}')
      if [[ "X${PID}X" = "XX" ]] ;then
         IS_HTTPD_RUNNING=false
      else
         IS_HTTPD_RUNNING=true
      fi
   fi

else
   error "Neither \033[1mapache2\033[m nor \033[1mnginx\033[m is enabled on this machine"

   echononl "continue anyway [yes/no]: "
   read OK
   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
      echononl "Wrong entry! - repeat [yes/nno]: "
      read OK
   done
   [[ $OK = "yes" ]] || fatal "Interrupted by user"
fi


if [[ -n "$_HTTP_USER" ]] ; then
   if [[ -n "$HTTP_USER" ]] && [[ "$_HTTP_USER" != "$HTTP_USER" ]]; then
      warn "The script has determined \033[1;37m${_HTTP_USER}\033[m as Webservers user. This\n                     value differs from the value given in your configuration file, \n                     which is \033[1;37m${HTTP_USER}\033[m and takes precedence."
   else
      HTTP_USER=$_HTTP_USER
   fi
else
   [[ -n "$HTTP_USER" ]] || HTTP_USER=$DEFAULT_HTTP_USER
fi

if [[ -n "$_HTTP_GROUP" ]] ; then
   if [[ -n "$HTTP_GROUP" ]] && [[ "$_HTTP_GROUP" != "$HTTP_GROUP" ]]; then
      warn "The script has determined \033[1;37m${_HTTP_GROUP}\033[m as Webservers group. This\n                     value differs from the value given in your configuration file, \n                     which is \033[1;37m${HTTP_GROUP}\033[m and takes precedence."
   else
      HTTP_GROUP=$_HTTP_GROUP
   fi
else
   [[ -n "$HTTP_GROUP" ]] || HTTP_GROUP=$HTTP_USER
fi