Security: Explicitly define IFS to prevent misuse.

Security: Explicitly define IFS to prevent misuse.

The scripts are written with certain expectations.
This expectation may not be properly met if the `IFS` value is changed.
This can potentially be used to create some sort of exploit.

Explicitly define IFS and then do so at a local variable scope to prevent affecting the callers IFS setting.

Simplify some of the Controller rules.