Previously I spoke on why one should learn vi (summary: learn vi because it’s on every UNIX and Linux system you’ll install…). Well, why should one learn Perl?

Because it’s only every UNIX and Linux system you’ll install…. and on OpenVMS… and available for Windows, too.

Unlike vi, I’m not as big a fan of Perl as I once was: having been interested in (and a fan of) object-oriented programming (OOP) for years – it only took Ruby little time to dislodge me from my interest in Perl (that would have been just prior to Perl 5).

Yet, this does not matter: Ruby is nice, but not ubiquitous. In particular, making Ruby run on HP-UX has proven to be extremely difficult in recent years – and it is not loaded by default in any case. I don’t know of any UNIX that installs Ruby as part of the base package (or that makes it available at all).

Learning Perl is not as hard as it may seem: since it is ubiquitous, there are many excellent books from which to learn Perl – and excellent references as well:

I have all of these, and find all of them to be useful. In my progression of learning Perl (or relearning it…) I find that Effective Perl Programming is fantastic. Specifically, presents a series of items (or tips) then shows you how to use and understand the tip in detail. I recommend this book fully.

Don’t neglect Perl, as it is everywhere, unlike any other language (including Korn shell!). If all you write is Korn shell, then your program will be unusable in any environment that does not provide ksh (think Linux and FreeBSD and OpenVMS for three). It’s true: ksh is not installed on Linux by default: bash is – and FreeBSD uses the C shell. However, all three environments provide Perl.

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