General :: Perl Useful In System Administration And Application Development On UNIX?

It is just a general discussion on "How Can Perl Be Useful in System Administration and Application Development on UNIX and Linux Platforms"? I am doing pretty much well with Bash and PHP. In fact, I am learning and experimenting in depth in those two domains. The project that I am working for these days has several scripts which are written in Perl and Ksh. They interact with Ab Initio graphs and perform extensive jobs. Anyways, my current role doesn't require me to have knowledge of Perl but I don't see any harm in learning something new.

So, before I take it, I want to know how Perl can help me and what I can do with it as a UNIX / Linux System Administrator and Application Developer? I just looked at some of its keywords, functions, and commands. Perl Variables are identical to those of PHP. Conditional Statements, Loops, etc. are also much the same as found in any other computer languages. So, at first glance, I have got this feel that it wouldn't be much difficult for me to learn it. But what do you say? Do I really need Perl when I am focusing on PHP and Bash?