Kevin Stock posted the following to comp.sources.misc (Feb 1991):
I guess I must be cracking up. I've been trying to learn how to use the usersubs stuff in Perl, and also how to program in INTERCAL. Anyway, I ended up combining the two!
The following shar file is an instant mix package (just add Perl) for Iperl, which is Perl plus the INTERCAL operators. There's even a manual page - what more could you want?
Download the iperl shar from the usenet archives.
User subroutines are no longer used, so for those of you running Perl 5, Brett McCormick has reimplemented the INTERCAL operators as a Perl module.