does anyone know the return values of dbcopy (linux version)?

I want to automate the backup of my Groupwise POAs and MTAs with the help of cron jobs. In my own gwbackp bash script I use


the very next line is
if [ $? -gt 0 ]; then
# do some error reporting

My first attempts failed because I always get "1" as return value but the logfile does not show any errors. Searching the internet did not give an answer about return values of dbcopy.

Does anyone know something about return values of dbcopy (linux version)?