Version Of Informix

I've ever confused how to find the version of my informix db
My Informix CD Installer has gone and I want to know it's version
I have solution how to find the version:

1. Login as informix user
2. Dont't forget to export your INFORMIXDIR
3. Change your direktori --> cd $INFORMIXDIR/etc
4. Find the file with "-cr" extension --> ls -al grep cr
On my machine I have IIF-cr file
5. Then open your *.cr file --> more IIF-cr

It's really very very easy, is'n it ?