Principal Software Engineer/Architect, motorcyclist, drummer, and artist
If you would like to join an array of elements with a defined delimiter in Bash there is an easy way to go about it by using printf. Following is an example
#!/bin/bash
declare -a arr=()
for i in `seq 1 5`
do
arr=("${arr[@]}" $i)
done
# Generate a single string joined by a comma. The printf string can contain
# any arbitrary delimiter.
printf -v joined '%s,' "${arr[@]}"
# Print out the string minus the trailing comma
echo Sometimes you are making changes to a dependency in another of your go projects and instead of adding a replace command in the go.mod file you want to update that entry in go.mod to point to a specific commit in the repo.
To do so, all that you need to do is:
go.mod file resides in which you want to If you have to rename a large number of files under Windows it is very tedious to do it one-by-one via the gui. Instead of writing a batch file, Microsoft has a suite of tools called PowerToys. PowerToys installs a utility called PowerRename that will do the job.
I did this under Windows 10, but I imagine that it is the same in Windows 11 based on the documentation on the PowerToys installation page.
Following are a number of my commonly used docker commands for my own reference
Run the following in the same directory in which your Dockerfile resides
docker build -t <image-name>:<version> .Or you can specify the path to the Dockerfile
docker build . -t <image-name>:<version> -f /path/to/DockerfileEspecially useful when debugging commands that you will encapsulate in a Docker file, this will enable you to run a base image and then execute commands interactively → Continue reading “Docker Cheat Sheet”
Some of git’s nomenclature can be confusing, especially since it is context dependent. Following are some TLDR;s for dealing with resolving merge conflicts in different scenarios.
The meaning of --ours vs --theirs can depend on whether you are doing a rebase or a merge.
Assuming that the feature branch is checked out
git merge develop | git rebase develop | |
To keep changes from develop | --theirs | --ours |
To keep changes from feature | --ours | --theirs |
If, during a rebase there → Continue reading “Git Merge Conflict Resolution Cheat Sheet”
kubectl get namespacekubens <namespace-name>kubectl get podskubectl get pods -n <namespace>kubectl delete pod <pod-name>kubectl describe pods <pod-name>kubectl logs <pod-name> -c <init-container-name>Run the following. Instead of it installing the chart it will render the template and display the output
helm install --debug --dry-run <release-name> <path-to-chart-dir>To test with an overriding value
helm install <release-name> <path-to-chart-dir> --dry-run --debug --set k=vhelm listhelm get manifest <release-name[flags]One of the key features in go is simplicity. As a result there are a number of utilities and data structures that are common in other high-level languages that do not come with the go stdlib.
One of them is a stack. Following is a very simple implementation of a stack that uses a slice to store the data.
The following is an implementation of a simple stack that takes any kind of pointer.
import "fmt"
type Stack[T any] struct The GNU diff command on most Linux and UNIX systems will diff the contents of two files. With Bash, you can, using process substitution, take the output of any arbitrary command and process its input, or output, as a file descriptor. In this way, you can then use diff against the output of two commands as follows
diff <(cmd1) <(cmd2)Both cmd1 and cmd2 will appear as a file name/file descriptor. The < character indicates that the file descriptor should → Continue reading “Diffing the output of two commands”
For some things, a docker container will not work. For example, I am working on a Python project to automate the deployment and configuration of VMs and bare-metal boxes. It involves installing packages and configuring the OS and to properly test it requires a full fledged VM and not just a container.
Install packer. The description straight from apt show packer is “HashiCorp Packer – A tool for creating identical → Continue reading “Creating Custom Vagrant Boxes for Integration Testing”