Try
Code:
if [[ "${Nbr_BD_Link}" != "0" ]] ; then
Are you sure that the value of this variable will ever be 0 or do you mean if the value is null in terms of empty? Because then you might want to test with -z or if value is "".
This might be interessting for you:
Bourne/Korn Shell Coding Conventions at OpenSolaris.org
