I wanted to extract a paticular file path from a text file (yum repository file) The file contents looks like this My requirement is to extract sslclinetkey path of both rhel-8-for-x86_64-appstream-rpm and rhel-8-for-x86_64-baseos-rpm through the command line or script Any help would be appreciated UPDATE I t…
Tag: linux
Pipe into a shell/bash script from Web URL
How to download a script from URL, execute it, and pipe something into it – all with one command? I have a shell script to which I can pipe stuff: The script is moved to http://example.com/do-stuff.sh Try to do something like this: but it doesn’t work. Data does not get piped into the script. Ther…
Heroku cannot detect the buildpack to use for this application automatically. error when trying to deploy/push files to heroku – any fixes?
I have a Python trading bot which I want to run in cloud with the help of Heroku. The Python code works just fine, but when I try to push the files after add and commit, I am getting error which says heroku cannot detect the buildpack and heroku pre-receive hook declined I tried to fix it, but nothing seems
How do I install a signal handler for a custom I/O signal?
I am trying to set up a signal and signal handler to rebuffer CAN frames as they arrive. Below is my code. I can send a frame from the computer running this code, but when I send a frame back the other way, nothing happens. I am holding the programme with scanf(). Can you see why this signal handler is
how to add curr timestamp to while loop in container in pod in kubernetes?
This command is where i need to insert into a file “success! Wed Jun 8 20:28:01 WAST 2022”,i.e. current timestamp. But it keeps writing ‘success date’ Answer You could use command substitution for this. That would be in shell or bash, the same. Additionally, you may need to escape the …
Node.js – Asynchronously edit JSON file and prevent interferance from other async calls
I am making a Discord bot in node.js, and need to store some per-guild data. I want to store it in separate JSON files in data/<guild.id>.json using the built in fs/promises. I have a function setGuildData(guildID: string, dataToAssign: object) that reads the current JSON file, parses the JSON to fileDa…
I was trying to use conda env create command in amazon linux 2, it is taking forever at “Collecting package metadata (repodata.json): “
i had tried to run conda env create -f using miniconda and anaconda3 on an EC2 instance using Amazon linux 2, still it is taking forever at *Collecting package metadata (repodata.json): * , can anyone help me where i was going wrong, Thanks in Advance. Answer The issue was because of space (AFAIK), my EC2 ins…
why memcpy is slower than copying data in bytes granularity?
I write three different codes to copy data from a 4GB buffer to another 4GB buffer. I measure their bandwidth and the cache miss with perf stat. The code is shown below: Compiling it with gcc memcpy-test.c -o memcpy-test. The first one uses memcpy to copy memcpy_sz bytes data for each time. I test this with 8…
Command to list reordered ls columns works in terminal but not through running a script?
I’m trying to make a script that will print information of all files in a given directory in order of owner, group, filename, then permissions separated by commas. The code I wrote works fine when ran in terminal, but when I try to run it through a script with a directory given as $1, it only prints the…
what alternative methods for sudo echo without bash -c
I must run the echo in the script my.sh with sudo because permission. I do not want to execute the script with sudo my.sh. I do not want to use bash -c “…” because escaping. Are there no other solutions? my.sh Answer The problem you are encountering here is that the output redirection >/f…