Cheatsheets
Cheatsheets are compact, copy-paste friendly references for common Linux commands and tools, so you can find syntax, options, and examples quickly.
netstat Cheatsheet
Quick reference for listing network connections, listening ports, routes, interface counters, and protocol statistics with netstat
Netcat Cheatsheet
Quick reference for using the Netcat nc command to test ports, listen for connections, transfer files, and send raw network requests
timedatectl Cheatsheet
Quick reference for checking time status, changing time zones, controlling NTP sync, and setting the system clock with timedatectl
PostgreSQL Cheatsheet
Quick reference for connecting to PostgreSQL, managing databases and roles, granting privileges, and running backup commands.
du Cheatsheet
Quick reference for the du command: check directory sizes, human-readable output, depth limits, sorting by size, exclusions, and apparent size.
nslookup Cheatsheet
Quick reference for querying DNS records and checking name resolution with nslookup
tail Cheatsheet
Quick reference for viewing the end of files, following logs, and using tail with lines, bytes, and pipelines in Linux
htop Cheatsheet
Quick reference for monitoring processes, sorting tasks, filtering output, and managing processes with htop in Linux
lsof Cheatsheet
Quick reference for finding open files, processes, ports, and deleted files with lsof in Linux
fsck Cheatsheet
Quick reference for fsck: check Linux filesystems, run safe repairs, force checks, review exit codes, and handle boot-time recovery
firewalld Cheatsheet
Quick reference for managing firewall rules with firewalld on Linux
df Cheatsheet
Quick reference for the df command: check disk space, display formats, filesystem filtering, inodes, and custom output fields
top Cheatsheet
Quick reference for monitoring processes, CPU, and memory usage with top in Linux
diff Cheatsheet
Quick reference for the diff command: compare files, output formats, filtering, and patch workflow
export Cheatsheet
Quick reference for exporting shell variables and functions to child processes with export in Bash
env Cheatsheet
Quick reference for listing, clearing, and overriding environment variables with env in Linux
Python Cheatsheet
Quick reference for Python 3 syntax, data types, string and list methods, control flow, functions, file I/O, and exception handling.
kill Cheatsheet
Quick reference for sending signals to processes by PID with kill and killall in Linux
watch Cheatsheet
Quick reference for rerunning commands at intervals and monitoring output changes with watch in Linux
tcpdump Cheatsheet
Quick reference for capturing and filtering network packets with tcpdump in Linux
su Cheatsheet
Quick reference for switching users and running commands with su in Linux
ping Cheatsheet
Quick reference for testing network reachability and latency with ping in Linux
xargs Cheatsheet
Quick reference for building commands from standard input with xargs in Linux
wc Cheatsheet
Quick reference for counting lines, words, bytes, characters, and longest line length with wc in Linux
useradd Cheatsheet
Quick reference for creating Linux users with useradd, including home directories, shells, groups, and account policies
less Cheatsheet
Quick reference for navigating, searching, and controlling output with the less pager in Linux
pkill Cheatsheet
Quick reference for finding and terminating processes by name, user, and pattern with pkill in Linux
ln Cheatsheet
Quick reference for creating hard links and symbolic links with ln in Linux
tee Cheatsheet
Quick reference for splitting command output to terminal and files with tee in Linux
gzip Cheatsheet
Quick reference for compressing, listing, testing, and decompressing files with gzip and gunzip in Linux