Why did I Write them in Perl?

I use whatever computer language is most suitable for a particular task (and often mix several to create a single program). The Perl programs for download from my site are all simple or general purpose file processing utilities. Perl is good for that task because:

Text processing: Perl has lots of sophisticated built in text processing commands almost ideal for the file processing tasks. These programs would have taken far longer to write in C.
Cross platform: Perl is available on many different operating systems so I won't have to scrap & rewrite these programs when I change between computers.
Cost: It is free.
Adaptable: Being an interpreted script language & fairly free format, it is quick to write or adapt Perl programs for one-off specific tasks. If you want one of these programs to behave slightly differently from how I have made it, it will probably be quite quick for you to tweak it by altering its source code. The alternative scheme, for the programmer to put in every possibility they think the user might want and create a graphical user interface for the settings, would have taken so long that I would not be bothered writing them. (Well, I did try once a few years ago. Writing a multiple file search & replace program in Microsoft Visual C++ with a GUI took 3 days! The Perl equivalent without a GUI took a couple of minutes.)
Microsoft Windows deficiency 1: Most of the computers I use run a Microsoft operating system (typically Win NT4 or Win 2k at present) and, compared to Unix shell languages, their Microsoft DOS derived shell programming language is pathetic. Therefore I use Perl as shell script substitute on Microsoft Windows (an alternative would be to install a Unix emulator).
Microsoft Windows deficiency 2: Microsoft Windows also lacks file bulk processing programs ('sed', 'grep', 'awk' etc.). Perl has equivalents to these built in so, once again, I use it to make up for useful things Microsoft missed out.