Tag: shell

Sed is truncating first character if it is starting with “v” while appending in file

I am stuck in one of my production code where I am trying to append some content at the start of file and if the content which I want to append is starting with “v” , its getting truncated. Steps to reproduce: Output: Desired Output: Answer Your use of the backslash is wrong. Check this: Your escaping leads to the

Shell script to replace all spaces in only the column headers to underscore in a csv file

bash csv linux shell

I am trying to just replace the spaces in the column headers only with underscores(_). this is my sample data Input Output My sample code is something like this, sorry its very rough! Answer Unless your example is too simplistic, you just have to change all spaces to underscores in line 1

Bash export variables but only for current command

bash linux node.js shell zsh

I want to load some environment variables from a file before running a node script, so that the script has access to them. However, I don’t want the environment variables to be set in my shell after the script is done executing. I can load the environment variables like this: However, after the command is run, all of the environment

How to print IP address from Shell Script?

bash linux shell

Below is my command line I want to get output of IP address(10.1.2.133) alone as output. How to write command line for that? Answer If you don’t mind a solution which is not elegant, but does the job, just pipe the output of your grep command into This splits the line first by the = and then :. If the

Changing contents of a tsx file through shell script

bash linux sed sh shell

I have a requirement to change the contents of config.tsx file that contains values like: I want to change this content using a shell script and save the file. Changed content can look like: How can I do this? Answer This should work: The -i option will edit the file in place. If you first want to try the command

How logical operators works

if-statement linux logical-operators shell unix

I tried below but it doesn’t work. Throwing some errors. Exp1 or expr2 should evaluate first & at result should be evaluated with expr3 ( &&) i tried as per suggestion, it throws error as Fyi- that date is val1 value. Answer You might see different results based on the shell or version, eg: sh vs bash vs ash. One

Can substring expansion be used in dash shell or bourne shell?

bash docker linux shell ubuntu

I’m converting an app to a new image, and the existing commands use substring expansion to set the artifact version like so: mvn clean versions:set -DnewVersion=”0.1.$VCSINFO.I${INFO:0:6}.M$OTHER_INFO”. I’m using a ubuntu image that defaults to /bin/sh, and I am unable to figure out how to either do something equivalent in bourne shell, or switch shells to run the command. I know

shell if statment executing even if its not true [closed]

bash linux shell

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed 2 years ago. Improve this question

Redirect logs of pods in my k8s to a file with pod name

kubernetes linux shell

I was trying to redirect logs of pods in a k8s into a file of their name. kubectl get pods | awk ‘{print $1}’ | tail -2 | xargs -I {} kubectl logs {} > {} This is the result. demo@demo1:~/log$ ls {} What I need is, if this is the pod details demo@demo1:~/log$ kubectl get pods NAME READY STATUS

Bash terminal error when using ‘unmask’ command [closed]

bash linux shell terminal