Recent questions tagged Perl

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perl - How do I find which elements in one array aren't in another?

I am new to programming and hence I am stuck on a basic level problem. Following is code I wrote for comparison. But ... "$_ "; close(FILE); } See Question&Answers more detail:os...

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

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680 views

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perl - MIME::Lite 3.030 - NET::SMTP with smtps (port 465)

MIME::Lite can pass extra parameters to Net::SMTP constructor. Version MIME::Lite 3.030 does not include SSL on its ... to mail server: $! "; See Question&Answers more detail:os...

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

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366 views

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perl - Why does $foo->{bar} autovivify but %$foo doesn't?

I have the following code: $headers; some_sub( %$headers ); When I call some_sub I get an error: Can't use an ... , ], body => $body ); See Question&Answers more detail:os...

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

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638 views

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perl - Why do hash keys have different order when printing?

I want to build several hashes using the same keys and for the keys to have the same order when I print them ... when I run the code repeatedly. See Question&Answers more detail:os...

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

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632 views

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perl - Import password-protected xlsx workbook into R

How can I import a worksheet from a password-protected xlsx workbook into R? I would like to be able to convert ... perl code that can do it. See Question&Answers more detail:os...

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

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552 views

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perl - Why doesn't print output anything on each iteration of a loop when I use sleep?

Today in my college a teacher asked me a question. He wrote this code on the paper and said "What will ... is getting print on each iteration? See Question&Answers more detail:os...

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

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620 views

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perl - How can I escape an arbitrary string for use as a command line argument in Bash?

I have a list of strings and I want to pass those strings as arguments in a single Bash command line call. For simple ... $1/g; return $_[0]; } See Question&Answers more detail:os...

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

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695 views

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perl - Converting relative path into absolute path?

I'm not sure if these paths are duplicates. Given the relative path, how do I determine absolute path using a shell ... absolute path: /a/b/c/d See Question&Answers more detail:os...

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

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797 views

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perl - "inappropriate ioctl for device"

I have a Perl script running in an AIX box. The script tries to open a file from a certain directory ... ENOTTY (Inappropriate ioctl for device) See Question&Answers more detail:os...

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

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757 views

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perl - How do I read UTF-8 with diamond operator (<>)?

I want to read UTF-8 input in Perl, no matter if it comes from the standard input or from a file, using the ... gives me this: a xC3x8A xC2xA7 b See Question&Answers more detail:os...

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

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832 views

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perl - Use of 'use utf8;' gives me 'Wide character in print'

If I run the following Perl program: perl -e 'use utf8; print "鸡 ";' I get this warning: Wide character in ... a one liner on the command line. See Question&Answers more detail:os...

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

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914 views

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perl - Create a multidimesional key of hash from array?

I want to create a multidimensional %hash from the @array. Suppose @array is like my @array=(1,2,3,4,5); ... before the last element in %hash. See Question&Answers more detail:os...

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

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1.1k views

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perl - OpenSSL DH Key Too Small Error

I am trying to connect to a closed-off server - an air-conditioner - using a simple PERL script #!/usr/ ... be in the underlying OpenSSL libs. See Question&Answers more detail:os...

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

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770 views

1 answer

perl - regex help on unix df

I need some help tweaking my code to look for another attribute in this unix df output: Ex. Filesystem Size Used Avail ... ); }; print "$cap "; See Question&Answers more detail:os...

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

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940 views

1 answer

perl - How to create recursive hash of hash ? (With unlimited deep)

Please, I try to create a complexe datastructure. I know how to do $branch{'level1'}{'level2'}{'level3'}='leaf'; ... How can I do please ? A. See Question&Answers more detail:os...

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

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744 views

1 answer

perl - How do I extract the domain out of an URL?

How do I extract the domain out of an URL? Is there a Perl Module? I could not find any. See Question&Answers more detail:os...

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

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675 views

1 answer

perl - Using Encode::encode with "utf8"

So as you probably know, in Perl "utf8" means Perl's looser understanding of UTF-8 which allows characters that ... 'utf8' and 'UTF-8'? See Question&Answers more detail:os...

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

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870 views

1 answer

perl - What does !! (double exclamation point) mean?

In the code below, from a blog post by Alias, I noticed the use of the double exclamation point !!. I ... related The List Squash Operator x!! See Question&Answers more detail:os...

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

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687 views

1 answer

perl - What is the difference between `read` and `sysread`?

read and sysread have very similar documentation. What are the differences between the two? See Question&Answers more detail: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 - no pg_hba.conf entry for host

I get following error when I try to connect using DBI DBI connect('database=chaosLRdb;host=192.168.0.1;port=5433', ... I know what i miss here? See Question&Answers more detail:os...

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

0 votes

693 views

1 answer

perl - Using my with parentheses and only one variable

I sometimes see Perl code like this: my ( $variable ) = blah.... What is the point of putting parentheses around a ... $var2, $var3 ) = blah... See Question&Answers more detail:os...

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

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584 views

1 answer

perl - Which cpan installer is the right one? (CPAN.pm/CPANPLUS/cpanminus)

There are multiple installers for cpan modules available; I know of at least CPAN.pm (comes with perl,) ... installers I should know about? See Question&Answers more detail:os...

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

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591 views

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perl - How do I tell CPAN to install all dependencies?

How do I tell CPAN to install all dependencies? I tried setting these in cpan: cpan> o conf prerequisites_policy ... when it asks something). See Question&Answers more detail:os...

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

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661 views

1 answer

perl - How to pass a variable from a child process (fork by Parallel::ForkManager)?

My query: In the following code i had tried to bring the print $commandoutput[0] to be shifted or passed into ... $lines=shift; print $lines; } See Question&Answers more detail:os...

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

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578 views

1 answer

perl - Why is this program valid? I was trying to create a syntax error

I'm running ActiveState's 32 bit ActivePerl 5.14.2 on Windows 7. I wanted to mess around with a Git pre- ... exit. How is this valid syntax? See Question&Answers more detail:os...

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

0 votes

607 views

1 answer

perl - regex to match word boundary beginning with special characters

I have regex that matches words fine except if they contain a special character such as ~Query which is the ... may contain a special character? See Question&Answers more detail:os...

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

0 votes

681 views

1 answer

perl - How to extrace pg_backend_pid from postgresql in shell script and pass it to another process?

I need to run bin/psql on the command line (or script) and print its pg_backend_pid out, so that the ... done through shell script or 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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617 views

1 answer

perl - Regex to match any character including new lines

Is there a regex to match "all characters including newlines"? For example, in the regex below, there is no output from ... +?)(END)/; print $2; See Question&Answers more detail:os...

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

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