ZIPIFS does just what is says on the tin!
ZIPIFS is a simple command line tool to zip-up (do I really need to explain that ZIP means compress? I don’t think so) anything in the IFS. If you have a ZIP file in the IFS it will zip that ZIP FILE – which wildly does make it slightly smaller.
This command is super useful when you want to email IBM i integrated file system objects.
NOTE: This uses the IBM i implementation of Java (QSHELL: JAR command) which sidesteps the 2GB size limit that other ZIP commands get bitten by.