Using Check Mode
Run passwd_import first in check mode by using the -c option. In this mode, passwd_import attempts to simulate the results of a processing run, showing the conflicts that are encountered when passwd_import is run without the -c option.
Check mode gives you a good idea of the quantity and complexity of the potential conflicts. However, check mode does not make any changes to the registry. When you run passwd_import without the -c option and make changes to resolve conflicts, these changes can in turn create further conflicts not readily apparent in check mode.
If you encounter numerous conflicts in check mode, it is more efficient to manually edit either the registry or the UNIX group and password files to resolve some obvious conflicts before you run passwd_import.