diff --git a/config/config.sh b/config/config.sh
index ab9dccb37..07f684c10 100644
--- a/config/config.sh
+++ b/config/config.sh
@@ -1,8 +1,14 @@
-
+#!/bin/bash
 # Version majeure de Debian (..., 9, 10)
 debian_version=$(cat /etc/debian_version)
 debian_version=${debian_version%%.*}
 
+die() {
+  echo 
+  echo "Erreur: $1"
+  echo
+  exit 1
+}
 
 # Fix path
 export PATH="${PATH}":/usr/sbin:/sbin
@@ -12,7 +18,8 @@ umask 0022
 
 export SCODOC_DIR=/opt/scodoc/Products/ScoDoc
 
-export SCODOC_VAR_DIR=$(realpath -L "$SCODOC_DIR/../../var/scodoc")
+SCODOC_VAR_DIR=$(realpath -L "$SCODOC_DIR/../../var/scodoc") || die "can't set SCODOC_VAR_DIR"
+export SCODOC_VAR_DIR
 #  = /opt/scodoc/var/scodoc
 export SCODOC_VERSION_DIR="${SCODOC_VAR_DIR}/config/version"
 export SCODOC_LOGOS_DIR="${SCODOC_VAR_DIR}/config/logos"
@@ -24,22 +31,22 @@ export POSTGRES_SUPERUSER=postgres
 export POSTGRES_USER=www-data
 
 # psql command: if various versions installed, force the one we want:
-if [ ${debian_version} = "10" ]
+if [ "${debian_version}" = "10" ]
 then
  PSQL=/usr/lib/postgresql/11/bin/psql
-elif [ ${debian_version} = "9" ]
+elif [ "${debian_version}" = "9" ]
 then
  PSQL=/usr/lib/postgresql/9.6/bin/psql
-elif [ ${debian_version} = "8" ] 
+elif [ "${debian_version}" = "8" ] 
 then
  PSQL=/usr/lib/postgresql/9.4/bin/psql
-elif [ ${debian_version} = "7" ] 
+elif [ "${debian_version}" = "7" ] 
 then
  PSQL=/usr/lib/postgresql/9.1/bin/psql
-elif [ ${debian_version} = "5" ] 
+elif [ "${debian_version}" = "5" ] 
  then
    PSQL=/usr/lib/postgresql/8.3/bin/psql
- elif [ ${debian_version} = "6" ] 
+ elif [ "${debian_version}" = "6" ] 
  then
    PSQL=/usr/lib/postgresql/8.4/bin/psql
  else
@@ -53,7 +60,7 @@ fi
 export POSTGRES_PORT=5432
 
 # Utilise par le script de reset du mot de passe: 
-if [ ${debian_version} -ge "7" ]
+if [ "${debian_version}" -ge "7" ]
 then
   export ZOPE_VERSION=2.13
 else