PIWIK LOG ANALYTICS - Download multiple files

hello,

I have 5 apache log files at “/var/log/piwik/” emplacement for only one day.
1-20130201.log
2-20130201.log
3-20130201.log
4-20130201.log
5-20130201.log

What is the comportement of piwik for each file, if i execute this commande line?

import_logs.py --url=stats.canaltp.fr /var/log/piwik/*.log --idsite=1

All log is merge in databases and load on my web site?
Or Just the last file is loaded on my site?

Thank for your return.

all logs will be imported into piwik (just make sure they are loaded in order by date if logs contain same visit across many files)