Linux & Server Cheat Sheets

awk Command Examples

Column-wise text processing with paste-ready one-liners.

Bash

Linux commands, script syntax, and readline shortcuts.

chmod

Octal and symbolic permissions, special bits, and safe recursion.

find Command in Linux

Locate files by name, type, age, or size, then act on them.

grep Command Examples

Search files and pipes with the everyday flags and regex syntax.

rsync Commands

Copy and mirror over SSH with excludes, resume, and dry runs.

sed Examples

Stream editing: replace, delete, insert, and in-place file edits.

tar Command Examples

Create, extract, and compress archives, with every flag explained.

zsh Commands

Aliases, globbing, plugins, and PATH on the Mac default shell.

htop Commands

Sort, filter and kill processes, and read what top shows you.

lsof Examples

Find what is using a port, a file, or a mount, and read the output.

PM2 Commands

Run Node apps with logs, cluster mode, and boot persistence.

ps Command Examples

ps aux, ps -ef, and what every column in the output actually means.

strace Examples

Attach to a running process, filter syscalls, and read the output.

Caddyfile Examples

Copy-paste Caddyfile blocks for proxies, Docker, TLS, and rewrites.

HAProxy Config

Frontend, backend, and ACL config, plus checks and reloads.

nginx Directives

The directives, blocks, and reload commands you look up.

Traefik

Router rules, Docker labels, middlewares, and CLI flags.

curl Command

Requests, auth, downloads, debugging, and exit codes.

dig Command Examples

The dig DNS queries admins actually run, and how to read the answer.

netstat Commands

Find what is using a port with netstat -ano, ss, and lsof.

tcpdump Command Examples

Filter packets, read the output, save pcap for Wireshark.

PuTTY Commands

Linux commands, shortcuts, putty.exe options, plink and pscp.

screen Command Linux

Detach, reattach, and kill sessions, plus copy mode.

SSH Commands

Connect, copy files, manage keys, and open tunnels with OpenSSH.

tmux

Sessions, windows, panes, and copy mode with the default prefix.

apt Commands

Install, upgrade, hold, and repair packages on Debian and Ubuntu.

DNF Commands

Package management on Fedora and RHEL, where yum is just dnf.

pacman Commands

Arch package management with safe upgrade habits and the AUR.

iptables Commands

List, allow, NAT, and persist rules without locking yourself out.

nftables

List, add, and delete nft rules without locking yourself out of SSH.

UFW Commands

Allow, deny, limit, and audit Ubuntu's firewall.

Certbot Commands

Get, renew, and manage free Let's Encrypt certificates.

OpenSSL Commands

Inspect certificates, make keys and CSRs, and convert formats.

Docker Commands

Containers, images, volumes, networks, and cleanup in daily use.

Docker Compose Commands

The compose v2 CLI plus the compose.yaml keys that matter.

Git Commands

Every Git command you look up, from push to reset and revert.

Git Rebase

Worked rebase examples, from rebase -i to undoing one.

journalctl Commands

Read, filter, and prune systemd journal logs.

systemctl Commands

Start, enable, inspect, and repair systemd services.

nano Editor

The shortcuts people look up, starting with save and exit.

Vim

The Vim shortcuts people actually look up, from :wq to macros.