Developer Cheat Sheets & Reference Hub
High-density, interactive cheat sheets for Git, Docker, Kubernetes, Linux, Bash, SSH, Vim, SQL, Python, and Network protocols with instant 1-click copy.
Git Commands Reference Matrix
Branching, committing, rebasing, cherry-picking, stashing, and undoing mistakes with practical pro tips.
Docker & Docker Compose Cheat Sheet
Container lifecycles, exec sh, volume management, compose recipes, and disk pruning commands.
Kubernetes & Kubectl Cheat Sheet
Pods, deployments, rollout restarts, secret decoding, configmaps, and cluster troubleshooting commands.
Linux Terminal & Sysadmin Matrix
System resource monitoring, UFW firewall configuration, file permissions, and process management.
Bash Scripting Commands & Syntax Matrix
Strict mode, variable expansion, regex conditionals, file loops, exit traps, and stream redirection.
SSH & Remote Admin Commands Cheat Sheet
Ed25519 keygen, ~/.ssh/config profiles, local/remote port forwarding, proxy jump, and rsync sync.
Vim & Neovim Editor Commands Matrix
Modal navigation (hjkl), visual block mode, global search & replace (:%s), buffer splits, and macros.
Regular Expressions (Regex) Cheat Sheet
Character classes, lookarounds, lazy quantifiers, capture groups, and tested email/URL regex patterns.
Cron Job Schedule Expressions Matrix
5-part crontab syntax, business hours intervals, weekday triggers, and cloud automation schedules.
SQL Query & Database Cheat Sheet
SELECT, INNER/LEFT joins, window functions (ROW_NUMBER), GROUP BY, UPSERT, and indexing best practices.
Python 3 Programming Commands Matrix
List/dict comprehensions, slicing, pathlib file I/O, error handling, virtualenv, and decorators.
Markdown & GFM Syntax Cheat Sheet
GitHub Flavored Markdown tables, task lists, code block language tags, footnotes, and alert callouts.
HTTP Status Codes Matrix & Server Fixes
Complete 1xx, 2xx, 3xx, 4xx, and 5xx response codes with Apache and Nginx server resolution guides.
Common Network Ports Reference & UFW Rules
Standard TCP/UDP service ports (SSH, HTTP, HTTPS, MySQL, Redis, DNS) with ready-to-run UFW commands.
Tmux Commands & Keybindings Matrix
Sessions, window tabs, vertical/horizontal pane splits, copy-mode, and background workflow management.
cURL Command Line Recipes & API Cheatsheet
REST API requests (POST/PUT JSON), bearer auth, custom headers, file downloads, and latency timing metrics.
PostgreSQL CLI (psql) & Administration Matrix
psql meta-commands (\l, \dt+), database locks, running queries termination, pg_dump backup, and user roles.
Nginx Configuration & Server Snippets Matrix
Reverse proxying, SSL/TLS Let's Encrypt termination, Gzip/Brotli compression, rate limiting, and security headers.
MongoDB & Mongosh Queries Matrix
Mongosh syntax, find filters ($in, $gte), projection, updateOne ($set), aggregation pipelines, and unique indexes.
Redis CLI & In-Memory Data Store Matrix
Keys TTL, atomic strings (INCR, SET NX), hashes (HGETALL), lists/queues (LPUSH, BRPOP), and sorted sets.
Systemd, Systemctl & Journalctl Matrix
Service lifecycle (start, stop, reload), boot startup enablement, journalctl -u -f logs tailing, and unit overrides.
AWS CLI Cloud Infrastructure Matrix
AWS auth profiles, S3 bucket sync & upload, EC2 instance lifecycles, Lambda invocations, and CloudWatch logs.
GitHub Actions Workflow & CI/CD Matrix
Triggers (push, workflow_dispatch), runner matrix, secrets context, dependency caching, and build artifacts.
GraphQL Query, Mutation & Schema Matrix
Queries with arguments, field aliasing, fragment reuse, @include/@skip directives, mutations, and cursor pagination.
Apache .htaccess Configuration Matrix
HTTPS redirect, www canonicalization, Options -Indexes, IP blacklisting, SPA rewrite rules, and Gzip headers.
Helm Kubernetes Package Manager Matrix
Chart repos, helm upgrade --install, rollback revisions, template rendering, and values yaml overrides.
Terraform & OpenTofu CLI Commands Matrix
Init, plan, apply, state rm, targeting, variables, multi-environment workspaces, and debug logs.
Iptables & Netfilter Firewall Commands Matrix
Packet filtering chains, port allow/drop, stateful conntrack, rate limiting anti-DDoS, and NAT masquerading.
Ansible CLI & Playbook Commands Matrix
Ad-hoc commands, playbook dry-runs (--check), vault encryption, tags, and dynamic inventory graphs.
Conventional Commits & Semantic Versioning Matrix
feat, fix, chore, refactor, breaking changes, scope formatting, and SemVer version bump rules.
Sed & Awk Text Processing Commands Matrix
Regex substitution (s///), in-place edits (-i), line deletes, Awk column printing, and delimiters.
gRPC & Protocol Buffers (Protobuf) Matrix
Protoc compile flags, grpcurl CLI reflection, proto3 message syntax, repeated, and streaming RPCs.
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