My test file has text like: I am trying to match all single lines ending with semicolon (;) and having text “dummy(“. Then I need to extract the string present in the double quotes inside dummy. I have come up with the following command, but it matches only the first and third statement. With -o f…
Tag: perl
How do I grep/awk multiple lines from a cluster based on a pattern?
is there a way I can grep/awk multiple lines from a cluster based on a pattern? I have a file as follows: File.txt And the pattern is – “Dogs”, I would like the output to be: Is this possible? Answer or Notes: The first version loads the entire file into memory (but not the second). Both ver…
open command in perl
I am try to use open command in perl. But getting and error as follows. Command open(IN_TRIALS, ‘<‘, “F:/2010_nist_sre_test_set/data/eval/keys/coreext-coreext.trialkey.csv”) or die “cannot open trials list”; Error cannot open trials. how to fix this? Answer First, make s…
Recursively change file name in folder and subfolders without changing file path
I have files in a format like 639486572_016b0f3d-9ec3-4ad1-84ae-c98b68390322.wav. The files reside in a folder and sub-folder format that resembles a date. ./2019/05/31/639486572_016b0f3d-9ec3-4ad1-84ae-c98b68390322.wav. The goal is to remove everything before and including the _. Which im able to do with ren…
need perl to die when implicit open fails
I’m trying to migrate a sed script to a perl one-liner, because perl supports non-greedy regexp. I’ve taken advices from Non greedy (reluctant) regex matching in sed? and Why is my Perl in-place script exiting with a zero exit code even though it’s failing? I need my oneliner to exit with no…
How to extract multiple *.tgz files to multiple directories using PERL?
I am learning PERL lang. I have forced (and little confused) the issue with extracting *.tgz files. My point which I want to achieve is to extract multiple *.tgz files to multiple folders. So the structure comes: I want to extract these files to directories: Can someone help me with this, or give some hints h…
How to precise the Perl version when creating a package using conda-build
I am trying to create a package for a Perl module I have and then put it in a local channel to be able to install it in a conda environement. I am trying to follow the conda documentation but as it’s the first time I’m trying to do that, I kind of lost myself. Doc to create a conda
Linux readelf shows object sizes with different numeral system (Hex and Dec)
I’m investigating some objects inside ELF file and using readelf for that purpose. This sample of readelf shows the size (bytes) of the objects on column 3, On large objects, readelf prints in Hex instead of dec, This breaks my size sorting attempts. (sorting ignores hex value) I tried translating all h…
Redirect STDERR to a file from Perl in Linux
So, I was trying to catch the error messages from running some basic Linux command, using Perl. For example, I try to catch the STDERR when running the ldd command: But, even if the output of the ldd command does contain error messages such as ldd: warning: you do not have execution permission for, it wonR…
Replacement of PS1 variable in .bashrc using Sed or Perl
I am trying to replace a line in file and am running in to issues. Original File: Command I am running: Error message: I also tried sed: Result with Sed: Expected Result File: End Result This doesn’t have much to do with the question except to show folks what the PS1 will look like when working properly…