Git branching is fundamental to modern development workflows. A branch is a lightweight pointer to a commit that lets you work on multiple features, fixes, or experiments in parallel without affecting the main codebase. Understanding branching well is essential for team collaboration and maintaining a clean project history. Creating and Switching Branches Create a new…
Thunderbird wraps lines at a fixed character width by default during composition, which interferes with code snippets, preformatted text, and any content where line breaks matter. Here’s how to turn it off. Via Preferences The quickest method through the GUI: Open Thunderbird and go to Edit → Preferences (or Thunderbird → Settings on macOS) Navigate…
IBus daemon restarts aren’t always straightforward in GNOME, especially since menu options have been removed. You’ll need to kill the daemon and start a fresh one. Quick restart Kill the current IBus daemon: pkill -o ibus-daemon The -o flag terminates only the oldest process, which is typically the main daemon (not child processes). IBus usually…
The most straightforward approach is whitespace-mode, which provides built-in visual feedback for lines exceeding a specified column width. Add this to your Emacs configuration: (require ‘whitespace) (setq whitespace-style ‘(face empty tabs lines-tail trailing)) (setq whitespace-line-column 80) (global-whitespace-mode t) The lines-tail style highlights only the portion of the line exceeding whitespace-line-column, which is less visually intrusive…
X11 forwarding lets you run Chrome on a remote host and display it on your local machine. It’s quick to set up for occasional use, but for regular work or modern Linux systems, you’ll want to know when to use alternatives. Basic X11 Forwarding The simplest approach uses SSH’s X11 forwarding: ssh -X username@remote_host google-chrome…
Running Internet Explorer on Linux through Wine is theoretically possible but practically untenable. If you need to test in IE, understand upfront: Wine support for IE is broken, unmaintained, and will waste your time. Why IE on Wine Doesn’t Work Internet Explorer depends on a stack of Windows-specific components that Wine’s compatibility layer can’t reliably…
Emacs handles line ending conversions through its buffer coding system. Whether you’re converting CRLF (DOS/Windows) to LF (Unix) or the reverse, the process is straightforward. DOS to Unix (CRLF to LF) Open the file in Emacs and run: M-x set-buffer-file-coding-system RET undecided-unix Or use the keyboard shortcut: C-x RET f undecided-unix Then save the file:…
The simplest approach is to select text and run untabify: M-x untabify This replaces all tabs in the selected region with spaces, preserving column alignment. If no region is active, Emacs prompts you to define one. Convert the Entire Buffer Select all content, then run untabify: C-x h M-x untabify C-x h selects the whole…
The sort command’s -n flag only handles decimal numbers. When you apply it to hexadecimal values, it falls back to lexicographic (alphabetical) sorting, which produces incorrect results since hex digits don’t follow numeric order alphabetically. Given a file with hex addresses: 400000000 __crt0 400000039 __newr0 400001B14 get_my_task_id 200000020 reg1 20400001000 status Running sort -n will…
To see the current file path immediately, use the Elisp evaluation prompt: M-: buffer-file-name This displays the full path in the echo area. Alternatively, press M-x, type eval-expression, and enter buffer-file-name. In Elisp code Reference buffer-file-name directly in your configuration or custom commands: (message “Editing: %s” buffer-file-name) This prints to the echo area and logs…
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…
The simplest way to see your commit history as a tree structure: git log –graph –oneline This produces a text-based graph showing branch relationships and merges with abbreviated commit hashes: * b5dc8b9 Merge branch ‘main’ into develop |\ | * 7514ef1 revised the README.md | * 6692428 align size to page for both shalloc and…
By default, crond sends email notifications whenever a cron job produces output or encounters an error. For high-volume cron jobs or systems without a mail server, you’ll want to disable these notifications. Redirect output to /dev/null The simplest approach is to discard all output from your job: 0 2 * * * /usr/local/bin/backup.sh > /dev/null…
You can fetch a webpage as if you’re requesting from a mobile device by setting curl’s User-Agent header to match a mobile browser. Remote servers use the User-Agent header to decide whether to serve mobile or desktop versions of pages. Basic syntax Use the -A (or –user-agent) flag to specify a mobile User-Agent string: curl…
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…
The built-in etags command doesn’t recursively traverse directories by default, but generating TAGS files across your entire project is straightforward with the right tools and setup. Using ctags (Recommended) The simplest approach is ctags with the -e flag, which generates Emacs-compatible TAGS files: ctags -e -R . The -R flag enables recursive traversal. This works…
Bash provides comparison operators for conditionals through the test command (aliased as [), the [[ ]] compound command, and the (( )) arithmetic command. Each has specific use cases and behavior differences worth understanding. String Comparisons String comparisons work with test/[ and [[ ]]: Operator Meaning -n STRING String length is nonzero (true if not…
When debugging a program or understanding what it actually touches on your filesystem, you need to see which files it opens. Two tools do this well: strace traces system calls in real time, while lsof inspects a running process without the overhead. Using strace to capture file operations The simplest approach is to run strace…
The replication factor determines how many copies of each data block HDFS maintains across your cluster. The default is 3, which provides adequate fault tolerance for most deployments by surviving both node and rack failures simultaneously. Setting Cluster-Wide Default Replication To set the default replication factor for all new files, add the dfs.replication property to…
When you install a JDK on Linux, you need to configure environment variables so your shell uses the correct Java binary and build tools can locate the installation. If you have multiple Java versions installed, proper configuration becomes essential. Why Set Java Environment Variables Setting JAVA_HOME and PATH ensures: Tools and applications can locate the…