Did a google search on the question "Does PERL runs on RTLinux?", and came up with the following -> The RTLinux Manifesto which I thought was interesting...

Hope it is useful..

Update

Following is a direct quote from the above paper which I believe answers the question:

What makes RTLinux useful is that it extends the standard UNIX programming environment to realtime problems. RTLinux realtime interrupt handlers and tasks can be connected to ordinary Linux processes - either via a device interface where Linux processes read/write data, or via shared memory. A standard Linux process, perhaps executing a shell script or a Perl program, can collect data from a realtime handler or task, process and log it and display the results on X-Windows. Using Perl scripts to to control a realtime device from an ordinary PC may seem ridiculous, but it works surprisingly well.