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.
Also check out the README.solaris