Over the course of my career, I've written a variety of scripts to do the same thing over and over again. This particular script here takes a list of files and combines the files together for use in a CLASSPATH environment variable. It can be used for other things but I use it a lot for constructing CLASSPATH.
bash$ export CLASSPATH=`join.pl ~/.swank-clojure/*`
bash$ echo $CLASSPATH
This script gave me to the chance to try out my perl 5.10.1 distribution and a new perl 5.10 features e.g. say and Modern::Perl