Recent questions tagged Perl

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perl - Assigning using ternary operator?

I am on Perl 5.8 and am needing to assign a default value. I ended up doing this: if ($model->test ... to assign this more efficiently? Janie See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

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perl - How do I remove the first five elements of an array?

@array = qw(one two three four five six seven eight); <Some command here> print @array; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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perl - How to speed up MongoDB Inserts/sec?

I'm trying to maximize inserts per second. I currently get around 20k inserts/sec. My performance is actually degrading the ... (); $db->drop(); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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perl - How to decrypt hash stored by bcrypt

I have this script that encrypts a password but I don't know how to reverse it and decrypt it. This may ... ::makerandom_octet(Length=>16)); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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559 views

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perl - How do I update all my CPAN modules to their latest versions?

How do I update all my CPAN modules to their latest versions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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471 views

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perl - Why will it not install DBI?

I have installed XAMPP on windows 10. Running Apache and mySQL, works fine. I was testing Perl, and it worked too. ... .gz : make NO cpan>``` See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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518 views

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perl - How to move up call stack exactly at point of error?

I'm aware of this idiom: eval { ... }; $DB::single = 1 if $@; ...but, as far as I can tell, ... , and examine the frames in the call stack? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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perl - Why does the JSON module quote some numbers but not others?

We recently switched to the new JSON2 perl module. I thought all and everything gets returned quoted now. But i ... if to quote a value? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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635 views

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perl - Can't create an instance of WWW:Mechanize::Firefox

I've just installed WWW:Mechanize::Firefox, but when I tried to create an instance of this "class": my ... line 144 Can anyone help please? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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perl, removing elements from array in for loop

will the following code always work in perl ? for loop iterating over @array { # do something if ($condition) { ... all cases in perl. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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527 views

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perl - Is there any way to "auto-use" certain modules everytime I write a script?

As the title indicates, is there anyway that I can automatically tell perl to include the following in every perl ... again. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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489 views

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perl - Is there such a thing as a list in scalar context?

my $mind = ( 'a', 'little', 'confused' ); And it's because perldoc perlfaq4 explains the line above as follows ( ... So, is it a list or not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

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perl - Fast alternative to grep -f

file.contain.query.txt ENST001 ENST002 ENST003 file.to.search.in.txt ENST001 90 ENST002 80 ENST004 50 Because ENST003 ... to grep -f ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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591 views

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perl - How to match Unicode vowels?

What character class or Unicode property will match any Unicode vowel in Perl? Wrong answer: [aeiouAEIOU]. (sermon here ... be a vowel will do. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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714 views

1 answer

perl - Can't locate Git.pm in @INC

When I run git add -p, I see: Can't locate Git.pm in @INC (@INC contains: /usr/local/lib/perl5/ ... I installed the XCode Command Line Tools. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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457 views

1 answer

perl - Extract a variable and add it to a separate XML file

I have a script that logs in and returns a session ID. I need the session ID so that I can populate an XML file ... What is the way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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563 views

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perl - Passing a Variable to a script calling itself

My Script is storing a ClearCase View in a Variable. To operate in this View, the Script needs to call itself ... start the View two times then. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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403 views

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perl - How differs the open pragma with different utf8?

Do these three versions all behave differently? use open qw( :encoding(UTF-8) :std ); use open qw( :encoding(UTF8) ... open qw( :utf8 :std ); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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446 views

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perl - What is the universal way to use file I/O API with unicode filenames?

In Windows there is a common problem: the filenames should be converted to local codepage, before they are passed to ... still not in the box? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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496 views

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perl - Is it safe to rename files while using readdir?

While scanning a directory with readdir, can you safely rename files without worrying about entering an infinite ... ask the question anyway. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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491 views

1 answer

perl - How to handle filenames with spaces?

I use Perl on windows(Active Perl). I have a perl program to glob the files in current folder, and ... thing. (Simple ones welcome..) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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652 views

1 answer

perl - Why CONCAT() does not default to default charset in MySQL?

What is the reason, that using CONCAT() in pure UTF-8 environment MySQL still treats concatenated string (when some ... it as bug or feature? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

1 answer

perl - How to install/config Git::Hooks to use with Gerrit

The Git::Hooks is a Perl framework for implementing Git/Gerrit hooks. What is the procedure to install and config it to use with Gerrit? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

1 answer

perl - How to make a hash available in another module

for Ex : package test1 ; my %hash = ( a=> 10 , b => 30 ) ; 1; in Script : use test1 ; print ... How to make this avilable in script without sub See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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823 views

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perl - XML::LibXML, namespaces and findvalue

I'm using XML::LibXML to parse an XML document with a namespace. I therefore use XML::LibXML::XPathContext to ... to get the paired values? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

1 answer

perl - The fastest way (execution time) to find the longest element in an list

Is this the fastest (execution time) way to find the longest element in a list? #!/usr/bin/env perl use warnings; ... $a : $b } @array; say $l; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

1 answer

perl - Does the autodie-pragma have influence on the encoding?

Why do I get after the "autodie" a different output? #!/usr/bin/env perl use warnings; use 5.012; use utf8; use ... # Output: # k?se # k?¤se See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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588 views

1 answer

perl - Why doesn't ||= work with arrays?

I use the ||= operator to provide default values for variables, like $x ||= 1; I tried to use this ... I provide arrays with default values? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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