Java provides multiple ways to get the current time as an epoch value. The right approach depends on whether you need milliseconds, seconds, or nanosecond precision, and whether you’re working with UTC or time zones. Using Instant for UTC timestamps The most straightforward method is Instant.now(): Instant now = Instant.now(); long epochSeconds = now.getEpochSecond(); long…
Getting the current epoch timestamp is straightforward using the time package: package main import ( “fmt” “time” ) func main() { epoch := time.Now().Unix() fmt.Println(epoch) } The time.Now().Unix() call returns the number of seconds since January 1, 1970 UTC as an int64. Getting nanosecond precision If you need higher resolution, use UnixNano() for nanoseconds since…
The epoch timestamp (also called Unix time) represents the number of seconds since January 1, 1970, 00:00:00 UTC. PHP provides several straightforward methods to obtain this value. Using time() The simplest approach is the time() function: <?php $timestamp = time(); echo $timestamp; // Output: 1704067200 (example) ?> This returns the current Unix timestamp as an…
The date command is your primary tool for retrieving Unix epoch timestamps. It’s available on virtually all Unix-like systems and integrates seamlessly into scripts and command pipelines. Basic Epoch Timestamp date +%s This returns the number of seconds since January 1, 1970 UTC. Output looks like 1735689600. Higher Precision with Nanoseconds For microsecond or nanosecond…
Python offers several ways to get the current epoch timestamp, each suited to different use cases. The choice depends on your precision requirements and whether you’re working with timezone-aware operations. Using time.time() The simplest approach is time.time(), which returns the current time as a float representing seconds since the Unix epoch (January 1, 1970, 00:00:00…
Bash provides several methods to process files line by line, each with different performance characteristics and use cases. Using a While Loop with IFS The most common approach uses a while loop with the read builtin: while IFS= read -r line; do echo “Processing: $line” done < filename.txt Breaking this down: IFS= prevents leading/trailing whitespace…
Processing files line by line is a common task in systems programming, data processing, and log analysis. C++ provides several approaches with different trade-offs in performance, memory usage, and code clarity. Using std::getline with std::ifstream The most straightforward approach uses std::getline with an input file stream: #include <fstream> #include <string> #include <iostream> int main() {…
The standard sort command is single-threaded by default, which limits performance on modern multi-core systems. Several approaches exist to speed up sorting operations using parallelism. GNU Sort with Parallel Sorting Modern versions of GNU sort (8.23+) include built-in parallel sorting support. Enable it with the –parallel flag: sort –parallel=4 large_file.txt > sorted_output.txt The –parallel option…
Reading files line by line is a common task when handling large datasets, logs, or any text-based input where loading the entire file into memory isn’t practical. PHP provides several methods, each with different memory footprints and use cases. Using fgets() The most straightforward approach uses fgets() with a file handle: $file = fopen(‘large_file.txt’, ‘r’);…
Go compiles quickly and go run handles small scripts, but a REPL is more practical for interactive testing and exploration. Here are the best options available today. gore gore remains the most mature Go REPL. It’s actively maintained and handles most interactive development workflows. Install it: go install github.com/motemen/gore/cmd/gore@latest Basic usage: $ gore gore version…
There are several ways to retrieve the hostname on a Linux system from Python. The choice depends on your use case and whether you need the simple hostname or the fully qualified domain name (FQDN). Using socket.gethostname() The simplest approach uses the socket module from the standard library: import socket hostname = socket.gethostname() print(hostname) This…
Reading a file line by line is memory-efficient and the standard approach for handling large text files in Python. The key is choosing the right method for your use case. The Iterator Approach (Recommended for Large Files) For most scenarios, especially with large files, use the file object as an iterator: with open(‘file.txt’, ‘r’) as…
There are several ways to get a file’s size without importing the os module. Each approach has different use cases depending on your needs. Using pathlib.Path The most straightforward approach uses pathlib, which is part of the standard library: from pathlib import Path file_path = Path(‘example.txt’) size = file_path.stat().st_size print(f”File size: {size} bytes”) This is…
Linux powers most of the cloud infrastructure, supercomputers, and embedded systems globally. The field itself spans kernel development, system administration, performance tuning, networking, and DevOps. Researching systems effectively requires understanding where to look, what tools matter, and how to validate your findings against real-world constraints. Start With the Right Foundation Before diving into specific research,…
The default TeX Live packages available through standard repositories are often outdated and incomplete. The official TeX Live installer provides access to current versions and the full package collection, though it requires around 4-5GB of disk space. Prerequisites Before starting, ensure you have the required dependencies installed: sudo yum groupinstall -y “Development Tools” sudo yum…
Getting kernel function call stacks is essential for debugging driver issues, understanding kernel behavior, and performance profiling. The approach depends on what you’re trying to trace: live kernel execution, crash analysis, or post-mortem inspection. Using ftrace The kernel’s built-in ftrace framework is the first tool to reach for. It’s zero-overhead when disabled and has minimal…
When trying to mount an encrypted EncFS directory as a normal user, you may encounter this error: $ encfs -s ~/t/.enc ~/t/enc EncFS Password: fuse: failed to exec fusermount: Permission denied fuse failed. Common problems: – fuse kernel module not installed (modprobe fuse) – invalid options — see usage message Even though the same command…
The most common need is collapsing multi-line records into single lines. Here are the practical approaches: Using tr to remove newlines The simplest method removes all newlines: tr -d ‘\n’ < input.txt > output.txt This works well for data without embedded line breaks you want to preserve. For CSV or structured data where you need…
When running Ubuntu on older servers like Dell PowerEdge systems with legacy graphics cards (Matrox G200eR2, etc.), you may encounter extremely slow desktop performance. The issue typically stems from the X server falling back to unoptimized drivers or incorrect video mode detection. Identifying the problem First, check your current graphics configuration: lspci | grep -i…
The most common approach is using Apache’s mod_rewrite module. Add this to your .htaccess file in your document root: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{HTTP_HOST} !^www\. [NC] RewriteCond %{HTTP_HOST} !^$ RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [L,R=301] </IfModule> This uses a 301 permanent redirect, which tells browsers and search engines that the www version is canonical. The conditions…