diff --git a/recipe_gentoo.sh b/recipe_gentoo.sh
index e66f570..8b6c454 100755
--- a/recipe_gentoo.sh
+++ b/recipe_gentoo.sh
@@ -8,8 +8,33 @@ BLUE='\033[1;34m'
 GREEN='\033[1;32m'
 NC='\033[0m' # No Color
 
+REQUIREMENTS="GREP ECHO EMERGE NSLOOKUP IP HOSTNAME AWK SED CUT TR PING"
+
 . vars.sh
 
+# Check requirements
+for requirement in $REQUIREMENTS
+do
+    # Check if requirement tool exit on the system
+    which $(eval echo "\$${requirement}") &>/dev/null
+
+    # Return Code
+    RC=$?
+
+    if [ ${RC} -ne 0 ]
+    then
+    echo "ERROR : ${requirement} ($(eval echo "\$${requirement}")) is required to use this script. Requirements are : ${REQUIREMENTS}."
+        exit 1
+    fi
+done
+
+# Be sure only root can run the script
+if [ "$(id -u)" != "0" ]; then
+   echo "ERROR : This script must be run as root" 1>&2
+   exit 1
+fi
+
+
 # Print packages not installed or with error at end script
 PACKAGES_TO_CHECK=""
 
@@ -22,7 +47,7 @@ IP_NOT_RECORDED_IN_DNS=""
 PING_FAILED=""
 
 # Get ALL locales IPs except loopback
-LOCALES_IP_WITHOUT_LOOPBACK=$(ip a |grep inet |grep -v 'fe80\|127.0.0.1\|::1/128'| tr -s " " |cut -f3 -d' '| cut -d\/ -f1)
+LOCALES_IP_WITHOUT_LOOPBACK=$(ip addr show scope global | awk '/inet/ { sub(/\/.*$/, "", $2); print $2 }')
 
 BOOL_ADMIN_IPV4_NOT_CONFIGURED=0
 BOOL_ADMIN_IPV6_NOT_CONFIGURED=0
@@ -70,6 +95,8 @@ echo "-------------------------------------------------"
 echo -e "------- ${BLUE}RECIPE GENTOO - CHECK BASIC CONFIG${NC} ------"
 echo -e "-------------------------------------------------\n"
 
+# Voir pour mettre ./ à la place de .
+
 . recipes/recipe_check_packages.sh
 
 . recipes/recipe_check_hostname.sh