SSD performance varies significantly based on drive model, interface (NVMe vs SATA), and workload characteristics. Understanding how to benchmark your drives is more useful than memorizing typical specs—here’s how to measure actual throughput on your hardware. Basic Throughput Testing with dd The dd utility is the simplest way to measure sequential I/O performance. Here’s a…
When running tree across multiple servers or sharing output with teammates, you’ll notice the formatting can vary significantly. Some systems display box-drawing characters while others use ASCII pipes and dashes, making diff comparisons and documentation inconsistent. Understanding the Charset Differences The tree command respects the system’s locale and character encoding settings. By default, it will…
The git status command shows repository state visually, but when you need to detect it programmatically in bash — say, to fail a CI pipeline or prevent deployments — you need a different approach. Quick Method: Check Unstaged Changes The most reliable way to detect uncommitted changes is with git diff: if [[ -n $(git…
When you need the commit hash of the latest commit, there are several ways to get it. The most direct approach is using git log with format options rather than parsing output with grep. Using git log with –format The cleanest method is to use git log with the –format option: git log -1 –format=”%H”…
[md] gThumb’s preferences aren’t always obvious when you’re looking through the traditional menu bar. The location depends on your desktop environment and gThumb version. ## GNOME Desktop On GNOME 3 and later, preferences are accessed through the application menu rather than the window menu: 1. Open gThumb 2. Click the application name (“gThumb”) in the…
When working with file I/O in C on Linux, you’ll often need to convert between low-level file descriptors (returned by open(), socket(), etc.) and higher-level FILE pointers (returned by fopen()). This is common when integrating different libraries or mixing POSIX I/O with standard C I/O. Getting a FILE Pointer from a File Descriptor Use fdopen()…
Chrome stores passwords encrypted in the system keyring (GNOME Keyring, KWallet, or Pass depending on your desktop environment). To export them in plain text, you’ll need to create a temporary Chrome profile with basic (unencrypted) password storage, sync your passwords from Google Cloud, then extract them from the SQLite database. Prerequisites Chrome or Chromium installed…
When clients connect to your OpenWRT router via DHCP, they typically receive the router itself as the default gateway. Sometimes you need to advertise a different gateway — whether you’re running a proxy, load balancer, or multi-gateway setup on your network. This is done via DHCP option 3 (the router option in the DHCP specification)….
Once your HP printer is working on a Linux system, enabling the scanner requires installing SANE (Scanner Access Now Easy) and HP-specific backends. If wireless connectivity is already established for printing, the scanner should be discoverable on the same network. Install Required Packages On Fedora: sudo dnf install sane-backends sane-backends-devel hplip hplip-common On Ubuntu/Debian: sudo…
When troubleshooting email delivery or verifying mail server configuration, you need to look up the MX (Mail Exchange) records for a domain. On Linux, two tools handle this: host and dig. Both are reliable, though dig is generally preferred for its flexibility and cleaner output format. Using dig to query MX records The dig command…
Finding reliable, free image hosting is essential for developers, bloggers, and content creators. Your choice depends on your use case — whether you need temporary sharing, permanent hosting with transformations, or stock imagery. Imgur Imgur remains the straightforward choice for quick image sharing and temporary hosting. You can upload without an account, get an instant…
When an NFS server goes down or becomes unreachable, client mounts can end up in a “Stale NFS file handle” state. Standard umount and umount -f commands fail, leaving you stuck with an unusable mount point and no clean way to recover without rebooting. The solution is to use umount -l (lazy unmount), which immediately…
By default, Apache2 ignores .htaccess files. The AllowOverride directive controls which directives in .htaccess Apache will process. To enable .htaccess, you need to configure Apache to allow overrides. Enable AllowOverride Edit your Apache configuration file. On Ubuntu/Debian, this is typically: sudo nano /etc/apache2/apache2.conf Find the <Directory /var/www/> block and change AllowOverride None to AllowOverride All:…
Virtual hosts allow you to serve multiple websites from a single Apache server and IP address. This is the standard approach for shared hosting and cost-effective server deployments. Basic Virtual Host Setup The foundation of multi-site hosting on Apache is the VirtualHost directive. Each domain needs its own block that specifies where its files live…
Firefox uses a profile system to isolate settings, extensions, bookmarks, and browsing data. By default, Firefox only allows one instance per profile to run at a time—new instances redirect to the existing process. If you need multiple Firefox windows with different profiles open at once, you need to disable this behavior. The -no-remote Flag The…
The nomodeset kernel parameter tells Linux to disable kernel mode setting (KMS), forcing the graphics driver to use basic VESA modes instead of native driver features. This is useful for troubleshooting display issues during boot or installation. When You Need nomodeset Common scenarios that require nomodeset: Black screen during boot with certain GPUs (especially Nvidia…
When you need writes to one or more files to automatically go to another file, you have several options depending on your exact use case. The most common scenario is capturing output from commands, monitoring file changes, or duplicating writes across multiple destinations. Using tee for Command Output Duplication The tee command duplicates standard input…
A 403 Forbidden error when running git push means your credentials aren’t valid or you lack permission to access the repository. This is one of the most common Git frustrations, but it’s usually fixable once you understand what’s actually happening. Why 403 Errors Happen Your authentication method has expired or been revoked Your GitHub Personal…
Skype periodically fails to start with a “system is unavailable” error when it can’t read or write to the user’s temporary directory. This typically happens when the temp folder becomes corrupted, has permission issues, or contains orphaned Skype cache files that prevent proper initialization. Understand the Problem On Windows, each user account has a temporary…
Long lines in text files can be difficult to read in a terminal. Linux provides several built-in tools to wrap or fold long lines to fit your screen width, each with different strengths. Using fold — Simple Line Wrapping fold wraps lines at a specified character width: # Wrap at 80 characters fold -w 80…