Programming language tutorials, syntax guides, and language-specific features.
Running a blog for over a decade means accumulating a lot of technical debt. Commands change, tools get deprecated, Python 2 becomes Python 3, and posts that were accurate in 2013 start quietly misleading readers in 2026. For systutorials.com, that meant roughly 1,375 posts needed attention — some desperately. Doing that manually would take months….
A crypto option gives you the right — but not the obligation — to buy or sell a cryptocurrency at a fixed price before a set date. Unlike a futures contract, where you’re locked in, an option lets you walk away if the trade goes against you. Your downside is capped at the premium you…
Crypto futures are contracts to buy or sell an asset at a predetermined price on a specific expiry date. They function similarly to traditional financial futures but operate within crypto markets. Key characteristics: Expiry dates: Set end dates, typically weekly, quarterly, or annual contracts Price convergence: As expiry approaches, the futures price converges with the…
When you use the first page as a title or cover page, you typically want page numbering to start from the second page as “1”. Word makes this straightforward using the header/footer tools. Enable Different First Page Formatting The first step is to tell Word to handle the first page differently from the rest of…
R handles JSON data effectively through packages designed for parsing and manipulating structured data. The most practical approach for fetching JSON from REST APIs is using the jsonlite package. Install and load jsonlite Install the package once: install.packages(“jsonlite”) Load it in your R session: library(jsonlite) Fetch JSON from a REST API Use fromJSON() to retrieve…
Comments and tracked changes are essential features for collaborative document work in LibreOffice. Both ODT and DOCX/DOC formats preserve comments and revisions, but controlling how they appear in printed output requires specific configuration. Accessing the Print Comments Settings To print comments in the page margins: Open your document in LibreOffice Writer Go to File >…
The simplest way to install R on macOS is through Homebrew: brew install r If you don’t have Homebrew installed, install it first from https://brew.sh. Verify the installation by launching R from the terminal: R You should see the R version and prompt. To verify everything works, run a quick demo: demo(graphics) q() Type n…
RSS feed readers have become essential for staying on top of content from multiple sources. If you’re switching from Feedly to Follow.it, the migration is straightforward — both services support OPML (Outline Processor Markup Language), a standard format for exporting and importing feed lists. Export Your Feed List from Feedly Feedly makes exporting your feeds…
Start by updating your package manager and installing R: sudo apt update sudo apt install r-base This installs the base R distribution from Ubuntu’s default repositories. For more details on R installation, see the dedicated R installation guide. Install RStudio Desktop Once R is installed, you can add RStudio Desktop as your local IDE. Download…
Google shut down Feedburner’s management interface, leaving it in indefinite maintenance mode. While RSS remains a critical format for feed distribution across platforms like WordPress and other CMS software, you need an alternative service for feed management and subscriber tracking. follow.it is a solid Feedburner replacement that handles RSS feeds, subscriptions, and analytics. This guide…
Thunderbird’s built-in calendar support (Lightning) handles local calendars, but you need two extensions to sync with Exchange Online: TbSync — manages cloud account synchronization for contacts, calendars, and tasks Provider for Exchange ActiveSync — adds ActiveSync protocol support to TbSync Install both from Thunderbird’s Add-ons Manager: Open Thunderbird and go to Menu → Add-ons and…
The Windows user account name can be changed through several methods, but Computer Management’s Local Users and Groups tool is the most reliable approach—its interface remains stable across Windows updates, unlike Settings which frequently changes. Open Local Users and Groups Right-click the Windows Start button and select Computer Management. This opens the management console. In…
Static linking is essential when distributing OCaml binaries across systems without managing runtime dependencies. OCaml supports two main approaches: glibc-based static linking (which retains some dynamic dependencies) and musl-based static linking (producing truly portable binaries). Static Linking with glibc The simplest approach uses glibc with the -static flag passed to the C linker. Since OCaml…
Emoji rendering at incorrect sizes in Thunderbird usually comes down to font configuration. Unlike browsers that inherit system emoji rendering, Thunderbird manages its own font stack, which can drift out of sync with your system fonts or get corrupted in Thunderbird’s cache. Install a Color Emoji Font Start by ensuring you have a proper color…
Thunderbird’s default feature set is deliberately minimal. Addons fill critical gaps for users managing multiple accounts, large archives, or specific workflow requirements. Here are the addons that solve genuine problems. Organization and Maintenance Remove Duplicate Messages Mail folders accumulate duplicates from IMAP syncing glitches, accidental re-imports, or migrations across devices. Remove Duplicate Messages scans folders,…
bbPress is WordPress’s standard forum plugin. When you need to modify how forum topics, replies, or other content displays, you’ll use WordPress filter hooks to intercept and transform the content before it reaches users. Common bbPress Content Filters Filtering Topic Content The bbp_get_topic_content filter runs after topic content is retrieved from the database but before…
The Control Center in iOS provides the quickest way to toggle wireless connections. Here’s what you need to know across iOS versions. Accessing Control Center On modern iPhones with Face ID (iPhone X and later), swipe down from the top-right corner of the screen. On iPhones with a Home button (iPhone 8 and earlier), swipe…
Evolution automatically wraps long lines in Plain Text mode, which can be frustrating if you need to preserve line breaks exactly as you’ve written them. Unlike some email clients, Evolution doesn’t support “soft wrapping” where text reflows visually in the composer but sends without hard line breaks. Using External Editor The most straightforward approach is…
GNOME Evolution’s email address auto-completion works by querying your local address books and, optionally, external sources. Here’s how to get it working properly. Check Your Address Books Evolution pulls auto-completion suggestions from multiple sources: Personal address book (local contacts you’ve added) On This Computer (system-wide contacts) Synced contact sources (Google, CalDAV, CardDAV, LDAP) To see…
Identifying which ports a specific process is using comes up regularly in debugging, security audits, and infrastructure management. Here are the practical methods. Using ss The ss command is the modern standard for socket inspection: ss -tlnp | grep <PID> This shows listening TCP sockets (-t for TCP, -l for listening). Add -u if you…