Tag: scripting

Word Splitting: The Bash Gotcha That Corrupts Filenames

Unquoted bash variables split on IFS and quietly break loops, file ops, and filenames with spaces. Here's why it happens and how to always quote right.

String Manipulation in Bash (Without sed or awk)

Bash has built-in string operations: substring extraction, find-replace, case conversion, and trimming. You don't need sed for basic text work.

bash `set -e` Doesn't Work Like You Think

set -e looks bulletproof, but it slips right through pipes, command substitution, and conditionals. The bash gotchas that bite at 2 AM, and how to fix them.

Bash Arithmetic Without bc

Bash has built-in arithmetic. You don't need bc for 90% of math. Here's how to do it right.

Bash Strict Mode: set -euo pipefail Explained

set -euo pipefail makes your bash scripts fail fast instead of silently. Here's what each flag does and why they matter.

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.

Finding the PID of a Process Using a Specific Port in Linux

Something's squatting on port 8080 and you need to know what. ss, netstat, and lsof one-liners to find the PID behind a port fast.

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.