echo "" | gawk '{s=1.9; print s}'

[Naulin Francois]

This gawk command :

  echo "" | gawk '{s=1.9; print s}'

result in :

  1.9
       (dot) with GNU Awk 3.1.1 (in RedHat 9)

and :

  1,9
       (comma) with GNU Awk 3.1.3 (in Fedora Core 3)

  Why ?

                  Thank You !