Unit testing, integration testing, CI/CD pipelines, debugging, and development operations. Explore Linux & Systems Administration Academy.
Thunderbird’s native calendar support doesn’t include direct iCloud integration, but you can sync iCloud calendars using CalDAV—Apple’s standard calendar protocol. This approach gives you read-write access to your iCloud calendars from within Thunderbird. Install TbSync and the CalDAV provider TbSync is the synchronization backbone you’ll need. It handles multiple calendar sources through various protocols, including…
Eclipse’s EGit plugin includes Git blame functionality built-in, allowing you to view revision details directly in the editor. This feature shows commit information, author, and date for each line without leaving your editor. First, ensure you have EGit installed. If you’re on a recent Eclipse version (2024 or later), EGit comes bundled. If not, install…
This document preserves the historical release notes for Linux v0.95 (March 7, 1992), one of the earliest public kernel versions. These notes provide valuable insight into early Linux development decisions and technical challenges. The original notes are presented here with minor formatting improvements for readability. Copyright Linux 0.95 is copyrighted under the GNU General Public…
Eclipse’s IDE capabilities make it useful for managing larger codebases, especially those version-controlled with Git. The Quick Diff feature lets you see at a glance which lines differ from your last commit—essential when reviewing your work before staging changes. Enable Quick Diff in Eclipse Open Eclipse and navigate to Window → Preferences. This opens the…
Git tracks every commit, allowing you to inspect the full change history of a repository. However, this history accumulates storage overhead—especially problematic when large files were accidentally committed. If you need to discard all history and keep only the current code state, you can rebuild a branch with a single commit. This approach works by…
Git submodules let you keep a Git repository as a subdirectory of another Git repository. When they get into a bad state—detached HEAD, local changes, merge conflicts—you need a clean reset. The complete deinit and reinit method This is the most thorough approach. It removes all submodule state and rebuilds from scratch: git submodule deinit…
Accidentally pushing a tag to a remote repository happens frequently. Whether you tagged the wrong commit, used an incorrect version number, or triggered an unintended CI/CD pipeline, you need a clean way to remove it. The Basic Command Delete a remote tag using git push with the –delete flag: git push origin –delete <tagname> For…
Renaming a Git branch involves three steps: rename locally, push the new branch, and delete the old remote branch. How you do this depends on whether you’re working from the command line or your Git hosting platform’s UI. Rename the branch locally The simplest command renames a branch in your local repository: git branch -m…
Traditionally, tools like strace used ptrace to monitor system calls. While effective for development debugging, ptrace stops the entire process for every syscall, causing 2-10x slowdown. This makes it unsuitable for production workloads where you need real-time visibility without tanking performance. Modern Linux offers significantly faster alternatives through eBPF (Extended Berkeley Packet Filter), which runs…
Patch files are essential for projects that use email-based code review or maintainer-driven workflows. They’re especially common in Linux kernel development, embedded systems, and projects that don’t rely on pull requests. Creating a patch from a single commit The standard approach is git format-patch: git format-patch -1 <commit-hash> This creates a .patch file containing the…
When managing packages on RHEL, CentOS, AlmaLinux, or Fedora, you sometimes need to prevent a package from being installed or updated from a particular repository. This is useful when multiple repos provide the same package and you want to control which version gets pulled in. Repository-specific exclusions with DNF Modern systems use DNF (which supersedes…
“Cleaning” history usually means rewriting it to remove large files, sensitive data, or to squash messy commits into logical units. This is destructive—it rewrites history and affects anyone who’s cloned the repo. Only do this on branches you control or coordinate with your team first. git filter-repo: The Standard Tool git filter-repo replaced the deprecated…
In XML, CDATA (Character Data) sections let you include text without worrying about XML special characters. Everything inside <![CDATA[ and ]]> is treated as literal text — no parsing, no entity references. This is useful for embedding code snippets, scripts, or any content with lots of <, >, or & characters. The catch: you can’t…
Bash associative arrays store key-value pairs, and you’ll often need to iterate over or collect just the keys. There are multiple approaches, each with different use cases. Setting up an example Start with a simple associative array: declare -A aa aa[“foo”]=bar aa[“a b”]=c aa[“test”]=value Note that keys can contain spaces — this matters for how…
SSH key management becomes critical when you’re handling multiple identities across different hosts. By default, ssh tries keys in a specific order, but you can explicitly configure which key to use for particular hosts through the SSH config file. Using ~/.ssh/config The cleanest approach is to define host-specific key configurations in ~/.ssh/config. This file lets…
When you initialize a new repository locally and try to push to GitHub or Bitbucket for the first time, you’ll likely encounter errors like: No refs in common and none specified; doing nothing. Perhaps you should specify a branch such as ‘master’. fatal: The remote end hung up unexpectedly This happens because your local repository…
If you need to jump to a particular byte position in a file, Vim provides the goto command. This is useful when debugging binary files, working with hex editors, or when error messages reference byte offsets. Using the goto command In normal mode, press go followed by the byte number: 20go This moves the cursor…
When you need to share work in progress or maintain a separate feature branch on a remote Git server, you’ll need to create a local branch and push it upstream. Here’s how to do it properly. Basic workflow The fundamental process involves three steps: Create a local branch and switch to it Make changes and…
When you have multiple consecutive citations like [14], [15], [16], [17], [19], LaTeX renders them individually by default, wasting space. Citation management packages automatically compress these to [14–17], [19], which is standard practice for numerical citation styles. Using the cite Package The cite package is the simplest approach. Add it to your preamble: \usepackage{cite} When…
Aggregating multiple RSS feeds into a single source is essential for monitoring diverse content — whether tracking news, blogs, project updates, or monitoring systems. Here are the practical approaches with working examples for 2026. Self-Hosted Feed Readers Miniflux is the modern standard for self-hosted feed aggregation. Written in Go, it’s lightweight, actively maintained, and provides…