This article: http://www.linuxask.com/questions/how-to-show-the-warnings-during-mysqlimport
says it is not possible to show warnings when using mysqlimport:
When you use mysqlimport to import data from text file, the number of warnings will be displayed at the end of import. But there is no way to show the actual warnings message.
Is that accurate? I have a server which does not allow LOAD DATA INFILE.
The answer is - no you cannot output warnings from mysqlimport.