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Zypper is a command line package manager that offers quite a lot of options. Let’s see those useful for updating a system. To update a system, it usually comes down to a few tasks: refresh repositories, that is to find out what new software exists in remote repositories see what…

I’ve recently come up against the following problem. I had something like this in a Docker file: RUN printf "$(cmd)" > release.json The line was longer and with more command substitutions but the length is really not the point. The points is there was a bug in one of those…

I regularly use Linux and Mac OS. I used to use Windows a lot as well but that’s fortunately the past. What I always hated was slow software updates, multiple restarts between and after updates. So far, I can only say that Linux is an exception, the user experience on…

Conditional job execution might not be the most used feature in GitHub Actions but it’s worth mentioning, especially because the conditions might be a bit confusing. Let’s take this workflow as an example: name: test on: workflow_dispatch: jobs: a: name: a runs-on: ubuntu-latest…

There’s sometimes need to check if a Docker image already exists in a registry and repository. There might be numerous tools for that, let’s have a look at three of them today. What I should probably say at the beginning is that I’m talking about a remote registry, not about…

I’ve recently experienced some troubles with DNS, so I needed a bit more visibility into DNS queries and replies. Here’s how to do that un Unbound. I use Unbound as a local DNS resolver. It can also do caching, which speeds things up a bit. When there’s a need for…

This is a good practice in accessibility. Make things that are clickable look different. I was searching on Macmillan for information about a possible API. Then I found this page: “This link” is actually a link that takes me somewhere else. But it doesn’t look like it. People with impaired…

Pipes are really powerful way to send data between processes, but they are also used way too much even where there’s no reason for them. A classic example that’s all over the Internet is something like this: cat file | grep word There is probably no harm when done once…