Bash: reshape a dataset of many rows to dataset of many columns – Debian
Suppose I have the following data: # all the numbers are their own number. I want to reshape exactly as below 0 a 1 b 2 c 0 d 1 e 2 f 0 g 1 h 2 i ...…
Alias for ssh client to autofill subnet – CentOS
I'd like to be able to run ssh 142 (for example) from a bash prompt and have it automatically expand to ssh 10.33.7.142. I'm thinking I should be able to do this from .bashrc, but I can't figure out how…
How to extract Active domain – CentOS
Is there any bash command/script in Linux so we can extract the active domains from a long list, example, I have a csv file (domains.csv) there are 55 million domains are listed horizontally, we need only active domains in a…
batch line-by-line bitwise functions (bitwise logic operator equivalent of diff/comm?) – CentOS
I'm researching the rhythmic elements of prime number sequences in binary. I have multiple sets of files containing vertical lists, and I want to apply bitwise logic operators between any two of them line-by-line. i.e. $cat binary-superprimes.txt 11 101 1011…
Detect & remove leading space in file or folder name – CentOS
I need to detect and remove lot of leading spaces on my folders & files. i try some code like : find /home/account -depth -name " *" -exec sh -c 'f="{}"; mv -v "$f" "...."' ; but i couldn't find…
From Bash -> Docker by name -> Ruby -> Clear Cache – CentOS
So, I'm trying to create a bash script to clear the cache on a containerized docker instance on my system, as a single fire-and-forget command on a legacy codebase. My current attempt has led me to the following script, which…
How do I correctly use the ansible hostname module? – CentOS
I am trying to use ansible to modify the hostnames of a dozen newly created Virtual Machines, and I am failing to understand how to loop correctly. Here is the playbook I've written: --- - hosts: k8s_kvm_vms tasks: - name:…
Why does bash evaluate comparison of numbers lexicographically not numerically? – CentOS
Could someone explain the following behavior of the "if" block of bash ? I use the following simple code check if the first_value is less than the second_value first_value=67 second_value=2 if [[ "${first_value}" < "${second_value}" ]]; then echo "Yes" else…
Concatenating hardcoded directory and user-created text file adds root-level paths when it shouldn't – Apache
I have written a script to allow a restricted user access to deleting files on a production webserver. However, to prevent fat-fingering issues leading to accidental filesystem deletion/problems, I have hard coded the base directory in a variable... But the…
Anaconda install fails on Red Hat 7.7 system – CentOS
I want to install Anaconda on system. Running Anaconda3-2019.10-Linux-x86_64.sh on Red Hat system hangs at PREFIX=/home/user1/anaconda3 Unpacking payload ... 0%| ---- |0/291 [00:00 Running on Ubuntu or CentOS docker container works fine. Tried setting temp path to different location. Also...…