Perl (not PERL), is a language, DOS (capitals for this one) is an operating system. You don't use them for the same purpose. If you have had 22 years of experience I am sure you will have read the odd installation file. Have you managed to find the file you downloaded? From looking at your previous post, you don't get DOS on Solaris (well perhaps an emulator), so you want to open a terminal window on whatever graphical desktop you are running and follow the instructions from installation file. I recently built Perl on Solaris 10, so if you can provide sensible information (what stage you are at? Have you unpacked the tar file? Got a compiler installed...) let me know where you are at with this, and what you cant do.
in reply to New to PERL but how is this better than DOS?
Update: Also check out the README.solaris file.