Acme-CPANModules-ReadingFilesBackward
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NAME
Acme::CPANModules::ReadingFilesBackward - List of modules to read files
backward (in reverse)
VERSION
This document describes version 0.003 of
Acme::CPANModules::ReadingFilesBackward (from Perl distribution
Acme-CPANModules-ReadingFilesBackward), released on 2023-10-31.
DESCRIPTION
Probably the fastest way, if you are on a Unix system, is to use the tac
command, which can read a file line by line in reverse order, or
paragraph by paragraph, or character by character, or word by word, or
by a custom separator string or regular expression. Example for using it
from Perl:
open my $fh, "tac /etc/passwd |";
print while <$fh>;
Another convenient way is to use the Perl I/O layer PerlIO::reverse. It
only does line-by-line reversing, but you can use the regular Perl API.
You don't even have to "use" the module explicitly (but of course you
have to get it installed first):
open my $fh, "<:reverse", "/etc/passwd";
print while <$fh>;
If your file is small (fits in your system's memory), you can also slurp
the file contents first into an array (either line by line, or paragraph
by paragraph, or what have you) and then simply "reverse" the array:
open my $fh, "<", "/etc/passwd";
my @lines = <$fh>;
print for reverse @lines;
If the above solutions do not fit your needs, there are also these
modules which can help: File::ReadBackward, File::Bidirectional.
File::ReadBackward is slightly faster than File::Bidirectional, but
File::Bidirectional can read forward as well as backward. I now simply
prefer PerlIO::reverse because I don't have to use a custom API for
reading files.
ACME::CPANMODULES ENTRIES
PerlIO::reverse
Author: GFUJI <https://metacpan.org/author/GFUJI>
File::ReadBackward
File::Bidirectional
Author: KIANWIN <https://metacpan.org/author/KIANWIN>
FAQ
What is an Acme::CPANModules::* module?
An Acme::CPANModules::* module, like this module, contains just a list
of module names that share a common characteristics. It is a way to
categorize modules and document CPAN. See Acme::CPANModules for more
details.
What are ways to use this Acme::CPANModules module?
Aside from reading this Acme::CPANModules module's POD documentation,
you can install all the listed modules (entries) using cpanm-cpanmodules
script (from App::cpanm::cpanmodules distribution):
% cpanm-cpanmodules -n ReadingFilesBackward
Alternatively you can use the cpanmodules CLI (from App::cpanmodules
distribution):
% cpanmodules ls-entries ReadingFilesBackward | cpanm -n
or Acme::CM::Get:
% perl -MAcme::CM::Get=ReadingFilesBackward -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n
or directly:
% perl -MAcme::CPANModules::ReadingFilesBackward -E'say $_->{module} for @{ $Acme::CPANModules::ReadingFilesBackward::LIST->{entries} }' | cpanm -n
This Acme::CPANModules module also helps lcpan produce a more meaningful
result for "lcpan related-mods" command when it comes to finding related
modules for the modules listed in this Acme::CPANModules module. See
App::lcpan::Cmd::related_mods for more details on how "related modules"
are found.
HOMEPAGE
Please visit the project's homepage at
<https://metacpan.org/release/Acme-CPANModules-ReadingFilesBackward>.
SOURCE
Source repository is at
<https://github.com/perlancar/perl-Acme-CPANModules-ReadingFilesBackward
>.
SEE ALSO
Acme::CPANModules::PickingRandomLinesFromFile
Acme::CPANModules - about the Acme::CPANModules namespace
cpanmodules - CLI tool to let you browse/view the lists
AUTHOR
perlancar <perlancar@cpan.org>
CONTRIBUTING
To contribute, you can send patches by email/via RT, or send pull
requests on GitHub.
Most of the time, you don't need to build the distribution yourself. You
can simply modify the code, then test via:
% prove -l
If you want to build the distribution (e.g. to try to install it locally
on your system), you can install Dist::Zilla,
Dist::Zilla::PluginBundle::Author::PERLANCAR,
Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two
other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps
required beyond that are considered a bug and can be reported to me.
COPYRIGHT AND LICENSE
This software is copyright (c) 2023, 2020, 2019 by perlancar
<perlancar@cpan.org>.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
BUGS
Please report any bugs or feature requests on the bugtracker website
<https://rt.cpan.org/Public/Dist/Display.html?Name=Acme-CPANModules-Read
ingFilesBackward>
When submitting a bug or request, please include a test-file or a patch
to an existing test-file that illustrates the bug or desired feature.
( run in 0.870 second using v1.01-cache-2.11-cpan-f56aa216473 )