diff --git a/check_webservice_load.sh b/check_webservice_load.sh
index 49f7744..9cfc5f4 100755
--- a/check_webservice_load.sh
+++ b/check_webservice_load.sh
@@ -225,7 +225,7 @@ if $check_mysql ; then
       # -
       if systemctl -t service list-unit-files \
             | grep -e "^mysql" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
          MYSQLD_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                  | grep -e "^mysql[^0-9]*\.service" \
@@ -288,7 +288,7 @@ if $check_postgresql ; then
       # -
       if systemctl -t service list-unit-files \
             | grep -e "^   postgresql" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
          PSQL_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                  | grep -e "^postgresql" \
@@ -329,13 +329,13 @@ if $check_apache ; then
       # -
       if systemctl -t service list-unit-files \
             | grep -e "^apache2.service" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
          APACHE_SERVICE_FILE="apache2.service"
 
       elif systemctl -t service list-unit-files \
             | grep -e "^apache" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
 
          APACHE_SERVICE_FILE=$(systemctl -t service list-unit-files \
@@ -380,7 +380,7 @@ if $check_nginx ; then
       # -
       if systemctl -t service list-unit-files \
             | grep -e "^nginx" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
          NGINX_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                  | grep -e "^nginx" \
@@ -442,7 +442,7 @@ if $check_php_fpm ; then
          # -
          if systemctl -t service list-unit-files \
                | grep -E "^php-?$_version" \
-               | grep -q enabled 2> /devnull ; then
+               | grep -q enabled 2> /dev/null ; then
 
             PHP_FPM_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                     | grep -E "^php-?$_version" \
@@ -493,7 +493,7 @@ if $check_redis ; then
       # -
       if systemctl -t service list-unit-files \
             | grep -e "^redis-server" \
-            | grep -q -E "(enabled|disabled)" 2> /devnull ; then
+            | grep -q -E "(enabled|disabled)" 2> /dev/null ; then
 
          REDIS_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                  | grep -e "^redis-server" \
@@ -527,7 +527,7 @@ if $check_website ; then
          # -
          if systemctl -t service list-unit-files \
                | grep -e "^php-$php_version_of_working_url-" \
-               | grep -q enabled 2> /devnull ; then
+               | grep -q enabled 2> /dev/null ; then
 
             PHP_FPM_SERVICE_FILE=$(systemctl -t service list-unit-files \
                                     | grep -e "^php-$php_version_of_working_url-" \