diff --git a/HowtoNagiosChecksWrapper.md b/HowtoNagiosChecksWrapper.md
index 82a073a8..c78b2aff 100644
--- a/HowtoNagiosChecksWrapper.md
+++ b/HowtoNagiosChecksWrapper.md
@@ -33,8 +33,12 @@ Détail du script `alerts_switch` :
 
 set -e
 
+readonly PROGNAME=$(basename $0)
+readonly PROGDIR=$(readlink -m $(dirname $0))
+readonly ARGS="$@"
+
 usage() {
-    echo "alerts_switch action prefix"
+    echo "$PROGNAME action prefix"
 }
 
 disable_alerts () {
@@ -72,11 +76,11 @@ log_enable () {
 }
 
 main () {
-    readonly action=$1
-    readonly prefix=$2
+    local action=$1
+    local prefix=$2
 
-    readonly file_path="/tmp/${prefix}_alerts"
-    readonly log_file="/var/log/${prefix}_alerts.log"
+    local file_path="/tmp/${prefix}_alerts"
+    local log_file="/var/log/${prefix}_alerts.log"
 
     case "$action" in
     enable)
@@ -97,7 +101,7 @@ main () {
     esac
 }
 
-main "$@"
+main $ARGS
 ~~~
 
 ## (Dés)activation des alertes