Questions tagged [perl]
Perl is a high-level, general-purpose, interpreted, dynamic programming language. It was originally developed by Larry Wall as a general-purpose Unix scripting language to make report processing easier, over a period with support from open source community, it has evolved and matured to be used for graphics programming, system administration, network programming, finance, bioinformatics, and other engineering applications.
1,364
questions
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Remove three lines from file until a match
982
01:25:09,473 --> 01:25:10,978
Stay with me.
983
01:25:09,473 --> 01:25:10,978
Stay with me.
984
01:25:15,390 --> 01:25:18,484
( MAJESTIC MUSIC )
I want to delete three lines below 984 (...
2
votes
2
answers
251
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Perl script to remove repeating header/trailer in file
I have created a perl script to merge 10 file in one. Each file has Keyword header/Trailer in file. So merged file has multiple header and trailer keyword. but I require the header and trailer to be ...
- 37
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3
answers
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Print a line matching pattern1 unless next line contains pattern2
I want to match lines that have foo unless the next line contains bar. So given a file containing:
1 foo 1
foo 2
baz bar bap
only 1 foo 1 would print. I got this to work using a negative lookahead /...
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2
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perl has problem if filenames contain dashes
... | perl -pe "s/([^$filespec]*)($filespec)/ ...
So I have a function where the above construction works fine if $filespec is most things. However if there's a dash in the file name I get an ...
- 2,527
3
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1
answer
274
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Different encoding/Unicode interpretation using terminal vs using shell script
I was working on a keymap script (map keys from one language keyboard layout to another). And after a lot of hard time trying to get everything working I found out that different characters are ...
- 141
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1
answer
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What are the different versions of the rename command? How do I use the Perl version?
This is a mess. How do I know which command to use when we expect Perl's rename with s/// sed-like syntax, when there're tons of different implementations of rename, that are different versions of the ...
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3
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645
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How to convert seconds to hh:mm:ss.ms when getting difference between 2 times
I performed a calculation that converts current timestamp giving milliseconds as well using perl command such as below:
perl -MTime::HiRes=time -MPOSIX=strftime -e '
$now = int(time() * 1000);
printf &...
0
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2
answers
525
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Remove multiple occurrences using SED command
We had a requirement to remove all /t characters that are not followed by quotes
sed 's/\\t\([^"]\)/foo\1/g'
this command worked good for single occurrence. What option do we need to add remove ...
- 1
0
votes
1
answer
177
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Missing EXTERN.h file when installing claws-mail on Fedora 37
I've trying to compile Claws-mail but got error:
perl_plugin.c:54:10: fatal error: EXTERN.h: No such file or directory
54 | #include <EXTERN.h>
I've installed perl-core perl-devel was ...
- 10k
1
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2
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How may I replace a string in an XML file?
I am trying to replace the string inside an XML file.
From
<hello="value" exampleno="xxxx:yyyyyyyy/dd=eeeee-ffffff,aa=bb ccc,dd=eeee,ff=gggg,hh=iii,jj=kkk,ll=mmmm" />
I want ...
- 19
1
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1
answer
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How many codes written by perl in debian?
My debian os:
cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
...
- 405
1
vote
6
answers
935
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Find and replace a multi line text file in another multi line text file
I fought with it for so long but I am now completely out of ideas. Maybe someone here will be able to help me. Here is what I want to achieve:
file_1.txt:
# Some comment
some_variable="test"
...
- 121
4
votes
1
answer
415
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Using perl's rename to renumber a list of files, starting at a certain value
I'm trying to renumber a list of files, which at a given point in their filename have one index consisting of a four-digit number. These files are consistently output starting from 0001, but need to ...
- 43
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1
answer
566
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Writing to unix socket file as fast as possible
I'm trying to write with perl to a unix socket file as fast as possible but failing on full message buffer. I tried autoflush and manual flush without success.
use IO::Select;
use IO::Socket::UNIX;
...
- 21
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1
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How can I create a .txt file containing data being generated in real-time in Linux terminal when a program is running?
I am running an AutoDock Vina program (using a Perl script) in Linux.
It generates lots of important data
(regarding binding free energy of protein-ligand docked complexes).
However, I cannot save ...
