diff --git a/script.sh b/script.sh
index bcc2114..71c92c0 100644
--- a/script.sh
+++ b/script.sh
@@ -1,5 +1,7 @@
-#: /bin/bash
+#! /bin/bash
 #
+set -euo pipefail
+IFS=$'\t\n'
 if [ $# -ne 2 ] ; then
    echo "gimme a min and max"
    exit 1
@@ -7,12 +9,14 @@ fi
 
 min=$1
 max=$2
+
 i=0
 
-v=$RANDOM
-while [ $v -gt $max -o $v -lt $min ] ; do
-   v=$RANDOM
-   let i++
+v=$((($RANDOM % $max)))
+while [ $v -lt $min ] ; do
+   v=$((($RANDOM % $max)))
+   i=$(((i+=1)))
 done
 
-echo "$v obtenu en $i itération(s)"
+echo "$v"
+exit $i