Recent questions tagged Perl

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perl - Check whether a string contains a substring

How can I check whether a given string contains a certain substring, using Perl? More specifically, I want to ... in the given string variable. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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819 views

1 answer

perl - How do I daemonize an arbitrary script in unix?

I'd like a daemonizer that can turn an arbitrary, generic script or command into a daemon. There are two ... demonizing of an arbitrary script: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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881 views

1 answer

perl - What does the function declaration "sub function($$)" mean?

I have been using Perl for some time, but today I came across this code: sub function1($$) { //snip } What does this mean in Perl? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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918 views

1 answer

perl - How can I install CPAN modules locally without root access (DynaLoader.pm line 229 error)?

Doesn't work with other modules, but to give an example. I installed Text::CSV_XS with a CPAN setting: ' ... .so exists in the above directory See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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936 views

1 answer

perl - Iterating hash based on the insertion order?

Don't want to sort the entries. using this does not preserve the order as well foreach my $val (keys %hash) { ... } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

790 views

1 answer

perl - What is the difference between library files and modules?

What is the difference between library files and modules in Perl? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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793 views

1 answer

perl - What regex can match sequences of the same character?

A friend asked me this and I was stumped: Is there a way to craft a regular expression that matches a sequence of the ... it wouldn't match 'bbb', 'ccc', etc. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

898 views

1 answer

perl - Which one is good practice, a lexical filehandle or a typeglob?

Some say we should use a lexical filehandle instead of a typeglob, like this: open $fh, $filename; But most ... ? Which one is considered a better practice? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

perl - Scalar vs List Assignment Operator

Please help me understand the following snippets: my $count = @array; my @copy = @array; my ($first) = @array; (my $copy = ... ; print($x = $y); print(@x = @y); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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984 views

1 answer

perl - How can I install a CPAN module into a local directory?

I'm using a hosted Linux machine so I don't have permissions to write into the /usr/lib directory. When I ... a module into some other directory and use it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

764 views

1 answer

perl - When is G useful application in a regex?

I am not clear on the use/need of the G operator. I read in the perldoc: You use the G anchor to ... next match on the same string starts at the beginning. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

709 views

1 answer

perl - Why is XML::Simple Discouraged?

From the documentation of XML::Simple: The use of this module in new code is discouraged. Other modules are available ... me what the key reasons for this are? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

763 views

1 answer

perl - Why use strict and warnings?

It seems to me that many of the questions in the Perl tag could be solved if people would use: use ... why should a Perl developer use strict and warnings? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

936 views

1 answer

perl - How do you catch a buggy sig die handler if the mechanism to debug code that everyone uses overrides it?

Let's say you use a cpan (or otherwise external) module, like our fictional one here Stupid::CPAN::Module::OfSatan ... buggy-sig-die-handler-if-the-mechanism-to-debug-code-that-eve...