Finaly, fetch is alright, added push warning

zshrc

@@ -15,7 +15,10 @@ export PATH=$PATH:/usr/local/sbin:/usr/sbin:/sbin:~/bin
 # Mise à jour automatique à partir du repo distant
 cd /home/$USER/rc
 git fetch
-if $(git status --porcelain -b 2> /dev/null | grep '^## .*behind' &> /dev/null); then
+local gst=$(command git status --porcelain -b 2> /dev/null)
+if $(echo "$gst" | grep '^## .*ahead' &> /dev/null); then
+    echo"You have unpushed business in /home/$USER/rc"
+elif $(echo "$gst" | grep '^## .*behind' &> /dev/null); then
     echo "Type Y to update .zshrc: \c"
     read line
     if [ "$line" = Y ] || [ "$line" = y ]; then