TITLE

AUTHOR

You want to list the signals available on a UNIX-like OS


code

=begin code :lang<raku>
#!/usr/bin/env raku

use v6;



# shamelessly stolen from a test
#
my @signals = $*KERNEL.signals.grep(Signal);

say :@signals.perl;

# vim: expandtab shiftwidth=4 ft=perl6

=end code


root

Perl 6 Cookbook: Introduction to Strings


01strings

Substrings


Swapping values


Converting between characters and numbers.


Using Named Unicode Chars


Reversing a String by Word or Character


Upper/Lower Case


Trimming whitespace from both ends of a string


Soundex Matching


Valid Number


02numbers

Convert to/from Roman Numerals


Logarithms


Complex Numbers


Convert Bases


Today's Date


03dates-and-times

DateTime to Epoch Seconds


Epoch Seconds to DateTime


Adding and Subtracting Dates


Subtracting Two Dates From Each other


From date to week of year, month of year, day of year


Hi-Res Timings


Specifying a list in your program


04arrays

Printing a list with commas


Iterating Over an Array


Traversing a hash


05hashes

Copy and substitute simultaneously 


06pattern-matching

Matching alphabetic wide characters


Opening a file


07file-access

Count File Lines


08file-contents

Process every word in a file


Read file lines backwards


Get/Set Filetime


09directories

Delete File


Copy/Move File


Process all files in a directory


Get list of files matching a pattern


Process files recursively


Splitting up a filename


Process files lazy


Accessing subroutine arguments


10subroutines

Constructing an object


13classes-objects-and-ties

Managing Instance data


Overloading operators


Executing SQL with DBIish


14database-access

Parsing program arguments


15interactivity

Test whether program is interactive or not


Clear the screen


Change text colour


Timeout Operation


16processes

Send a signal to a process


Catch ctrl-c


Writing a TCP Client


17sockets

Writing a TCP Server


Writing a CGI Script


19cgi-programming

Fetch uri


20web-automation

README.md

para

L<Examples| file:../examples/index.podlite>


L<Download |file:../download/index.podlite>


React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


HEADER

FOOTER

List Signals


You want to send a signal to a process on a UNIX-like OS


=begin code :lang<raku>
#!/usr/bin/env raku

use v6;



use NativeCall;

sub kill(int32, int32) returns int32 is native { ... }

signal(SIGHUP).tap( {say "caught HUP"});

kill($*PID, Signal::SIGHUP);

sleep 2;

# vim: expandtab shiftwidth=4 ft=perl6

=end code


You want to timeout an operation (possibly long running)


=begin code :lang<raku>
#!/usr/bin/env raku

use v6;



constant timeout = 3;

my $done = start {
    say "starting to sleep...";
    sleep 10; # long running operation here
}

await Promise.anyof($done, Promise.in(timeout));

if $done {
    say "operation completed";
}
else {
    warn "timed out after {timeout} sec(s)";
}

# vim: expandtab shiftwidth=4 ft=perl6

=end code


The Raku Knowledge Base


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

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=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

=end nested
=begin nested :!nested

=item1 B<Resoures>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


AUTHOR

See Also