I've just found out the HMRC (the UK's taxation department) uses Perl for at least some of its operations...

The system is troubled today and I received this error revealing the language

Ref: /home/ewf/MODULES/Common/ Error Code 401 at line 30

Update: corrected typo in title

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Re: UK tax system uses Perl
by choroba (Cardinal) on Apr 08, 2024 at 15:35 UTC
    That might be just a joke, a senior consultant created a "funny" 401 page for their PHP app and forgot about it.

    Or it might be security through obscurity - in fact, they're using Python, but they pretend to use Perl to scare the hackers.

    map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]