Tag: cli

GNU parallel for Embarrassingly Parallel Tasks

GNU parallel runs tasks in parallel across CPU cores. It's faster than xargs and easier than writing a job queue. Here's when and how to use it.

jq One-Liners Every Sysadmin Needs

jq is JSON on the command line. Here are 5 one-liners that actually solve real problems: filtering, extracting, transforming, combining, and debugging.

xargs vs while read: Which One and When

xargs and while read both loop over input, but they handle arguments, signals, and performance differently. Here's when to use each.

find Flags You Keep Forgetting

Practical find command examples: -mtime, -newer, -type, -exec vs xargs, -not, size filters. The patterns you google every time.

strace for Beginners: See What Any Process Is Doing

Use strace to trace system calls and debug mysterious errors without reading source code.

Using the Clipboard from the Linux Terminal

Copy and paste from the Linux terminal without a mouse. Master xclip, xsel, wl-copy, and integrate clipboard with tmux and SSH.

lsof: The Tool That Shows You Everything

Master lsof to find port conflicts, trace deleted files eating disk, and debug network connections.

The `at` Command: One-Time Scheduled Tasks in Linux

Schedule one-off Linux tasks with `at` instead of cron. Learn syntax, queue management, batch jobs, and when to use it for delayed reboots and reminders.

Understanding Grep: A Comprehensive Guide

grep is more powerful than you think — regex patterns, context flags, recursive search, and piping tricks that save hours of log digging.

Essential Linux Commands for Daily Use

The Linux commands every sysadmin reaches for daily — file ops, process management, networking, and text manipulation you can't live without.

Copying Files Between Docker Containers and Host Machines

Use docker cp to move files between running containers and your host machine — no volumes needed for one-off file transfers.

Multiple Actions with a Single docker exec Call

Run multiple commands in one docker exec call using sh -c — pipe commands, chain with && or ;, and avoid repeated container roundtrips.