Make sure fNameChange.pl and convert.pl are in the same folder as your .ogg files. Don't worry about spaces in the .ogg filenames,
the scripts adjust for this and rename your files with no spaces. Run convert.pl like this;
[djk@localhost ~]$perl convert.pl.
These scripts use sox to first convert .ogg files to .wav, then convert the resulting .wav files to .mp3.