Tag: bash

Bash One-Liners Worth Remembering

Twenty powerful bash one-liners every sysadmin should know—file ops, process hunting, networking, text processing, disk analysis

Bash for loops sequential counting

Master bash for loops, while loops, and seq for sequential counting — iterate over files, ranges, and arrays without losing your mind.

Directory FileCount

Count files in a directory (recursively or not) with find, ls, and tree — quick one-liners for when du just isn't telling you enough.

Find out whats taking up all the hdd space

Your disk is full and du is lying to you. ncdu, df, and find tricks to track down space hogs before your server goes down at 2 AM.

Linux CLI Tarball Extraction — Flags, Formats, Gotchas

Extract tar.gz, tar.bz2, tar.xz — flags demystified, compression compared, directory extraction, and the gotchas that trip you up.

Linux su with custom shell

Use su with a specific shell to switch users without the default login shell — useful when /etc/passwd points to something unexpected.

Logrotate & Compression

logrotate keeps your /var/log from eating the disk — configure rotation schedules, compression, and retention for any service log.

Recursively delete all empty subdirectories

Clean up empty directories with find and rmdir — safely prune orphaned dirs left after file migrations.

Bulk rename files in bash

Remove spaces and special characters from filenames using bash loops, rename, find, and parameter expansion tricks.

Sed 101

sed is the stream editor for making text substitutions, deletions, and insertions in files — the patterns you'll use 90% of the time.

Why You Should Switch to ZShell (zsh)

Switch your default shell to zsh on Linux — why zsh beats bash, installation, Oh My Zsh setup, essential plugins, and the gotcha that still catches everyone.

dotenv Files: The Mistakes That Leak Secrets

You committed .env.production once. Your database credentials are in git forever. Here's how to use dotenv without shooting yourself.