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perluniprops lists the Unicode properties of the version of Unicode it supports. For Perl 5.32.1, that's Unicode 13.0.0.

You can obtain a list of the characters that match a category using Unicode::Tussle's unichars.

I'm trying to implement an alarm in my Perl backend process so that it will terminate if it gets stuck for too long. I tried to implement the code given on the alarm documentation page on Perldoc (this is verbatim from the documentation other than the line that calls my program's key subroutine instead of the sample line in the documentation):

I'm trying to make a perl one-liner mimic awk's file-relative line number counter "FNR". In itself this is not a problem. In one attempt, I used the following command:

Why don't I have to use use Math::Trig; in my Perl program to call atan2()?

According to documentation, atan2() is not part of the "Perl Core".

I have Perl 5.18.4. I looked at the list of standard Perl modules, and I DO see Math::Trig listed, but I still thought that the "use" statement was required. Admittedly, my Perl knowledge is only about 6 months old at this point. So, a simple answer would be a quote from an official Perl document. Or, maybe there is something else going on here that I don't understand.

Here is an example of what I am talking about.

EDIT: For anyone who has arrived here with this issue, I found this documented almost verbatim in the perldoc at https://perldoc.perl.org/perlop#Conditional-Operator

In writing a simple subroutine, I found I kept getting incorrect results using the ternary operator, but correct results using a more simple if statement. I'm sure there is an explanation, but I'm simply not seeing it.

When fed the following input:

If I have two configurations of the same version of Perl for example,

• One compiled with -Dusethreads
• One compiled without it

Will both of those version be able to share the same corelist modules? Or will I need to a package a separate one too. Is there known XS code compilation oddities with this approach? Is it likely that anything built against a threaded Perl will work with a non-threaded Perl? Assuming the version is the same.

I have created a very small sample code below to illustrate how Perl's index() function's return value changes for empty substr ("") on string that is passed or not passed through Encode::decode().

According to Perldoc( https://perldoc.perl.org/perlop#Comma-Operator ):

Comma Operator

...

In list context, it's just the list argument separator, and inserts both its arguments into the list. These arguments are also evaluated from left to right.

In following code, I thought $n should be 1 but it became 2. What am I missing?

According to the perldoc -f die, which documents $SIG{__DIE__}

Although this feature was to be run only right before your program was to exit, this is not currently so: the $SIG{__DIE__} hook is currently called even inside evaled blocks/strings! If one wants the hook to do nothing in such situations, put die @_ if $^S; as the first line of the handler (see $^S in perlvar). Because this promotes strange action at a distance, this counterintuitive behavior may be fixed in a future release.

So let's take a basic signal handler which will trigger with eval { die 42 },