Questions tagged [perl]
Perl is a powerful, high level programming language. Questions about Perl should be limited to the Perl development environment, running Perl, or using Perl to automate tasks on your computer.
498
questions
0
votes
0
answers
54
views
Perform lookup on two files
I have a csv file that get's SFTP'd to a RHEL box I have setup. It then gets transformed a little before another process SFTP's in and grabs it sending it off to be imported to a DB of a 3rd party.
I ...
- 1
0
votes
1
answer
39
views
Combine two regex formulas into one (using notepad++)
Si cum îi semănau ! Fraţi buni, puindu-si, ca si el, tot sufletul
în ceea ce făceau, muncind din greu, luptind din greu, jert-
findu-se, fără nici un gînd de răsplată.
Simțind în tot ceasul,
...
- 816
2
votes
4
answers
65
views
REGEXL Find the string betweet 2 strings
In the exemple below, I want to use regex as to find the html tag <sony> between other 2 lines.
<table width="697" border="0">
<tr>
<td&...
- 119
1
vote
0
answers
88
views
Clear previous command output (not full screen)
Example
This is on the terminal screen:
user@host ~ % ls
dir1
dir2
dir3
user@host ~ % whoami
user
user@host ~ % date
Wed May 24 16:25:26 -03 2023
user@host ~ % [CURSOR IS HERE]
I'm trying to ...
- 63
0
votes
1
answer
219
views
How to install Perl modules in custom location?
I'm currently trying to install a Perl module, but the web hosting has specifically locked the custom Perl user install directory (they have a "install service" charging 7$ per module).
So ...
- 1,031
0
votes
1
answer
22
views
regexp in perl fails
Why is this failing?
WGroleau@MBP Chords % perl -p -i -e '(Trinidad|Donoso|Clifton|Frincke|Little|Church|Antonio) XYZ :\1\t:g;' *txt
Bareword found where operator expected at -e line 1, near ") ...
- 724
0
votes
1
answer
19
views
Perl LWP: how can I print the fetched result?
What are the elements of the class response from this code:
Or, how can I print the entire object response ?
#!/usr/bin/env perl
# Example code from Chapter 1 of /Perl and LWP/ by Sean M. Burke
# ...
- 39
1
vote
1
answer
50
views
Perl LWP: running a script returns an error
I have installed Bundle::LWP and after several minuets I'm getting this
$ perl -MLWP -le "print(LWP->VERSION)"
6.68
which sounds OK. However, running this script
#!/usr/bin/perl
# ...
- 39
0
votes
1
answer
180
views
Add line number at the end of each line in a text file
I have a text file which contains thousands of lines with same links. I want append the line number at the end of each line. For example;
https://example.com/
https://example.com/
these links would ...
0
votes
1
answer
35
views
Linux - Find string and then end of section
I have an XMLTV file. I need to get all of the programme sections for a specific channel. An example snippet:
<programme start="2023031305000 -0400" end="2023031305300 -0400&...
0
votes
1
answer
205
views
How to find the "pattern" in FASTA file and record the cordinates along with header
I am looking for a solution to search for a string of 17 base pairs in the FASTA file that is the human reference genome.
To clarify, in simple words and put the resources, i have tried grep function ...
- 3
1
vote
1
answer
45
views
Cygwin Perl autodie 'not located'
I have Cygwin installed (with its native Perl support). However, on running a make file supplied by a third-party, I get the following error:
Can't locate autodie.pm in @INC (you may need to install ...
1
vote
1
answer
33
views
perl extended regex pattern with (condition) behaves wrong, what I do false?
I use perl --version
perl 5, version 36, subversion 0 (v5.36.0) built for i686-linux-gnu-thread-multi-64int (with 52 registered patches
I have used following test lines with these results:
perl -we '$...
- 121
0
votes
1
answer
24
views
Perl RexEx Replace locks Apache access_log
I wanted to clean up my apache server logs, remove all the 301, 404, and so on, and after trying and failing with sed, I used Perl, which worked wonderfully, except... Then Apache no longer logs ...
- 505
0
votes
0
answers
16
views
How can Perl based daemons recover gracefully from momentarily unavailable NFS sources?
I have Perl scripts (running as daemons) on a large group of servers, where some Perl modules are used from an NFS mount.
Sometimes, these mounts are temporarily unavailable, and if at the exact ...
- 1,055
0
votes
3
answers
51
views
Replacing double new-line in multiple files
I do a lot of text cleanup with (example) perl -p -i -e 's:old:new:g;' *.txt but when old is \n\n and new is \n</p><p>\n, nothing changes. Tried escaping the angle brackets, but that didn'...
- 724
3
votes
1
answer
4k
views
What does --allowerasing option in dnf command do?
I am reading a book which instructs me to install 5.24 stream and minimal profile of perl module by running...
# dnf module install perl:5.24/minimal --allowerasing
Everything was explained in it ...
- 31
0
votes
0
answers
18
views
Looking for an efficient way to query "perldelta"s for news
A common problem I have with Perl is this:
I want to find out at which release some feature had been introduced.
There were several "perldelta" manual pages (one for each release), but I'm ...
- 516
2
votes
2
answers
106
views
Find and delete near duplicate lines with certain punctuation
I have a text file with millions of lines. Some lines contain the same alphanumeric sequence, but differ in case and punctuation. I consider these lines duplicates. I want to remove any duplicate line ...
- 35
0
votes
1
answer
189
views
Perl regex unable to match using hex or octal
I need to use Perl to work with a data file that contains a lot of unprintable characters, i.e. not within the displayable character range in the ASCII table. I tried writing regexes using octal ...
- 1
0
votes
1
answer
121
views
quote mark (U+0027) in perl substitution
I need to put two spaces between sentences in a large number of text files.
A sentence ending is defined as period, exclamation, or question, maybe a close-quote, and then a space. Tabs and line ...
- 724
0
votes
2
answers
533
views
Trouble with perl and UTF-8
If I interpret documentation ci=orrectly, perl --CSD is suppose to ensure that input and output, processed or commands, are using UTF-8 encoding.
But if I replace two hyphens -- with an em-dash — (U+...
- 724
1
vote
1
answer
43
views
How do I substitute the entire line in a text file for a portion of text in the line?
For example, I would like to make:
>sid|RSV210|ref|NC_001803.1| SM:RSV210
turn into
>RSV210
I believe that I could use sed to do this by the following
"s/>.*/>RSV210/"
but I ...
0
votes
1
answer
137
views
how can I put 2 files with the same number of lines side by side with Perl
how can I put 2 files A and B with the same number of lines side by side with Perl with
command line ? I cannot work with two filehandles on the command line.
0
votes
1
answer
35
views
Perl RE global matching is not working /.*(11).*/g
I have a file containing this single line:
111112111122113
I want to match all two element sequences of 1 in all occurrences.
But when I try this
$ perl -lne 'print $1 if /.*(11).*/g' u
I get only ...
0
votes
2
answers
518
views
Remove the file name from a messy path in a text file awk or sed
I have an xml file with many lines containing something like this:
Save="C:\Users\Administrator\Desktop\my files\1020\A54f\Drawing965.DWG" Module="0"
Save="C:\Users\...
- 35
0
votes
0
answers
135
views
Perl, modifiers /m /s/ /ms
I have seen in Larry's Wall book programming Perl 3rd edition what do the modifiers
/s
/m
/ms
in some example with \n . Now I cannot find the exact page.
Specifically the example showed that only the ...
- 161
0
votes
2
answers
69
views
opendmarc: hostnamefqdn() shows only short name / helo command rejected fqdn
I have problem with opendmarc. This software uses perl function to send report mails. So in the source code I see that /etc/opendmarc_reports uses also function hostnamefqdn() to pass it to helo ...
- 1
0
votes
1
answer
382
views
500 Internal Server Error when run perl file and no access to command line
I'm a newbie with Perl. I've created a simple file test.pl with the code:
#!/usr/bin/perl
print 'test';
uploaded it to my shared hosting with Linux where PERL is enabled and changed my PERL file ...
- 229
0
votes
1
answer
275
views
Why does this regexp — which attempts to match characters between “@” characters — fail?
I need to extract the second field of selected lines in a GEDCOM file. These lines are all of the following format:
% grep @ /tmp/XYZ | tail -5
0 @X701@ OBJE
0 @X702@ OBJE
0 @X750@ OBJE
0 @X765@ OBJE
...
- 724
-1
votes
1
answer
138
views
Need to autoincrement directory names but by avoiding some letters in the name
My script creates a set of directories aa, ab, ac, and so on
This script autoincrement directory names but I want to avoid the letters: I, O, P, Q, R, W while creating directories.
The script which I ...
- 3
1
vote
1
answer
439
views
Unable to install DBD::mysql on Ubuntu 20.04
I am unable to get DBD::mysql installed on Ubuntu 20.04. I get the following error:
Warning: No success on command[/usr/bin/perl Makefile.PL LIB=/home/htm/Lib]
DVEEDEN/DBD-mysql-4.050.tar.gz
/usr/bin/...
- 21
0
votes
1
answer
112
views
Sending args from bash to perl
I eally need help
I would like to send args from bash file to perl file. I dont know why it is not working for me. My code foe testing is bellow
*******bash code *********
#!/usr/bin/env bash
chmod +...
0
votes
1
answer
46
views
a very simple Perl script needed
I have the following text file G.txt.
I need a perl command
perl -e ...
that would extract all negative entries ending with Kč, so that first line it will be
-107,60
and last will be -63,00
I have ...
0
votes
1
answer
308
views
Combining two txt files containing name and last name on command line
I have two text files. First file have 20 Names listed in seperate lines and 2nd file have 20 surnames listed in seperated lines. How I can combine those files. So final text file have both first name ...
- 344
1
vote
1
answer
644
views
How to make fork() fail?
For a script I'm writing, it's important to properly handle a failed fork() (see https://rachelbythebay.com/w/2014/08/19/fork/ for the Why).
But how, without bringing my system down with processes, ...
0
votes
0
answers
132
views
Reading email headers in Perl
I have an email account ([email protected]) and an alias ([email protected]) pointing to the account.
An email sent to [email protected] is delivered to us[email protected] as expected.
Email headers in MS ...
- 21
0
votes
1
answer
73
views
Perl/Bash Solution to Test if a Folder Has Changed, Then Create Copy of It
I'd like to put together a script for a very rudimentary backup system that checks a directory recursively for any changes since the date another directory (the backup) was created and, if it finds ...
3
votes
0
answers
38
views
How to rename a perlbrew installed version
I installed Perl 5.32 with the name perl-5.32.0
$ perlbrew list
* perl-5.32.0
The installation was updated with perlbrew upgrade-perl and I now have 5.32.1
$ perl --version
This is perl 5, version ...
- 7,737
2
votes
1
answer
107
views
Shell special chars blowing up regexp(s) in all: sed, (g)awk, and perl [closed]
I would like to change the PS1 in my ~/.bashrc programmatically with any of the the most popular regexp tools { sed, awk or perl }. However, I have problems with special characters. Note that in the ...
- 21
0
votes
1
answer
98
views
Transpose vertically with a catch
I've been working through some issues preparing data for logstash ingestion. I have a decent chunk of the process worked out but I'm wondering if there's a better way to do this. Basically I need to ...
4
votes
2
answers
6k
views
Is there a way to execute a perl script from any location in the machine?
I'd like to know if there are other ways to execute a perl file without giving the path explicitly.
example:
perl ./images/seed/test.pl
I read on the export path command but I don't quite understand. ...
- 43
1
vote
1
answer
427
views
How do I upgrade SpamAssassin?
When I try to update SpamAssassin, it says it has the latest version.
# cpanm Mail::SpamAssassin
Mail::SpamAssassin is up to date. (3.004004)
However, the latest version says it is 3.4.4. https://...
- 5,796
1
vote
2
answers
707
views
Regex to substitute character with numbers around it in filenames with rename utility (perl based)
I would like to rename files that have the following format:
somethingblabla15T06:58_31+0000somethingblabla.bla
THe new name should be
somethingblabla15T06:58:31+0000somethingblabla.bla
So the _ ...
2
votes
1
answer
454
views
How to print absolute path of some file from c:\ root in perl?
Having this perl:
#!/usr/bin/perl -w
use Cwd qw[abs_path];
use autodie;
opendir C, "c:\\";
@ar = map { abs_path($_) } readdir(C) or die $!;
print $ar[0];
I am trying to print an absolute ...
- 331
2
votes
2
answers
562
views
Combine strings with same first word preserving their order
I have a file that contain many lines consecutive and non consecutive with same first word and i want to merge all those lines.Not finding any way. please suggest someone.
eg.
cat file
X blah blah ...
- 121
0
votes
1
answer
563
views
Associate .pl files with Prolog instead of Perl system wide
I'm learning Prolog at University and have a lot of *.pl files. I already managed to make gedit recognize them as Prolog files and not Perl Scripts for syntax highlighting following this question and ...
0
votes
3
answers
969
views
sed + how to replace numbers with parenthesis with sed/awk/other
we want to relapse the [1023,1024,1022] as described in the following file , with [1022]
more file.exm
{"topic":"nj_hgf_dfgef","partition":0,"replicas":[1023,1024,1022]},
{"topic":"nj_hgf_dfgef","...
- 787
0
votes
1
answer
423
views
OpenSSL Timestamp log location
I am trying to debug an openssl ts based perl http server. The server logs display an openssl ts -reply command failing with exit code 1.
Where can I see the logs related to this openssl command, or ...
- 1
2
votes
0
answers
184
views
Python and Perl not recognized in cmd even after adding in environment
It was fine yesterday, but it suddenly stopped working today.
Both my perl and python were not recognized in cmd. I read as much as i can online for the answers and follow the instruction. I have ...
- 21