diff --git a/install_backuppc_mac.sh b/install_backuppc_mac.sh
index 2c2fb74..800ac25 100755
--- a/install_backuppc_mac.sh
+++ b/install_backuppc_mac.sh
@@ -20,7 +20,8 @@ function GetDefaultUser() {
 # this performs the equivalent as adding a remote login user in system preferences using the gui
 function AllowUserToConnectToThisMachineUsingSsh()
 {
-	local userLogin="$1"
+	local userLogin
+	userLogin="$1"
 	dscl . append '/Groups/com.apple.access_ssh' user "${userLogin}"
 	dscl . append /Groups/com.apple.access_ssh groupmembers $(dscl . read "/Users/${userLogin}" GeneratedUID | cut -d " " -f 2)
 [[ "${DEBUG}" == "0" ]] && 	printf '\e[1;33m%-6s\e[m\n' "DEBUG : Autoriser les accès SSH pour ${userLogin}."
@@ -74,7 +75,8 @@ function GetMyHostKey() {
 
 ## IpAddress {{{
 function IpAddress() {
-	local strMyIpAddress=''
+	local strMyIpAddress
+	strMyIpAddress=''
 	strMyIpAddress=$(dig +short myip.opendns.com @resolver1.opendns.com)
 	if [ "${strMyIpAddress}" == '' ]; then
 		error "failed to retrieve the ip address of this machine"
@@ -86,15 +88,18 @@ function IpAddress() {
 
 ## MyFqdn {{{
 function MyFqdn() {
-	local strMyIpAddress=$( IpAddress ) # eg '129.20.27.49'
-	local strMyFqdn=$(host "${strMyIpAddress}" | awk '{print $5}')
+	local strMyIpAddress
+	local strMyFqdn
+	strMyIpAddress=$( IpAddress ) # eg '129.20.27.49'
+	strMyFqdn=$(host "${strMyIpAddress}" | awk '{print $5}')
 	echo "${strMyFqdn%?}" # remove the trailing '.'
 }
 ## }}}
 
 ## ListUsers {{{
 function ListUsers() {
-	local users=''
+	local users
+	users=''
 	for user in $(ls -d /Users/[a-zA-Z]*); do
 		user=$(basename "${user}")
 		case "${user}" in
@@ -111,10 +116,14 @@ function ListUsers() {
 
 ## AddUserBackuppc {{{
 function AddUserBackuppc() {
-	local userToBackup="$1" # the login of the user to backup
-	local homeDir="$2" # eg. '/var/lib/backuppc'
-	local userLogin='backuppc'
-	local groupId=$(id -g "${userToBackup}")
+	local userToBackup
+	local homeDir
+	local userLogin
+	local groupId
+	userToBackup="$1" # the login of the user to backup
+	homeDir="$2" # eg. '/var/lib/backuppc'
+	userLogin='backuppc'
+	groupId=$(id -g "${userToBackup}")
 	maxid=$(dscl . -list /Users UniqueID | awk  '$2 < 1000 {print $2}' | sort -ug | tail -1)
 	newid=$((maxid+1))
 	mkdir -p "$homeDir"
@@ -147,9 +156,10 @@ function AddUserBackuppc() {
 ## AllowBackuppcSudo {{{
 function AllowBackuppcSudo() {
 	# Get sudoers directory from the configuration
-	local sudoersDir=$(grep "^#includedir " /etc/sudoers | cut -d" " -f2)
+	local sudoersDir
+	sudoersDir=$(grep "^#includedir " /etc/sudoers | cut -d" " -f2)
 	if [ -f /etc/sudoers ]; then
-		local sudoersDir=$(grep "^#includedir " /etc/sudoers | cut -d" " -f2)
+		sudoersDir=$(grep "^#includedir " /etc/sudoers | cut -d" " -f2)
 		if [ ! "${sudoersDir}" == '' ]; then
 			printf '%b\n' "Configuration de sudo pour BackupPC."
 		else
@@ -157,7 +167,7 @@ function AllowBackuppcSudo() {
 [[ "${DEBUG}" == "0" ]] && 				printf '\e[1;33m%-6s\e[m\n' "DEBUG : Ajout de ${sudoersDir} dans le fichier sudoers."
 		fi
 	elif [ -f /private/etc/sudoers ]; then
-		local sudoersDir=$(grep "^#includedir " /private/etc/sudoers | cut -d" " -f2)
+		sudoersDir=$(grep "^#includedir " /private/etc/sudoers | cut -d" " -f2)
 		if [ ! "${sudoersDir}" == '' ]; then
 			printf '%b\n' "Configuration de sudo pour BackupPC."
 		else