Cheat sheet
42 entries match these filters
- 0421 grep, sed, awk and jq: the four text tools you will use every week A working reference for the four commands that handle most text on the command line: grep finds lines, sed edits them, awk… Intermediate · Cheat sheet · Linux, macOS Article jq & JSON on the command line · Modern command-line tools · Text processing 15 Oct 2026
- 0425 jq cheat script: pretty-print, filter and flatten JSON from a file or stdin A small read-only bash wrapper around jq with the recipes you keep looking up: pretty, compact, sorted keys, list paths, pick fields,… Beginner · Cheat sheet · Linux, macOS Script jq & JSON on the command line · Modern command-line tools · Text processing 15 Oct 2026
- 0414 HTTP headers you should set on every site The response headers that make a site safer and faster: HSTS, Content-Security-Policy, X-Content-Type-Options, frame protection, Referrer-Policy, Permissions-Policy and Cache-Control, with Nginx and… Intermediate · Cheat sheet · Any system Article Making requests · Web servers & reverse proxies 15 Oct 2026
- 0380 GitHub Actions cheat sheet: triggers, matrix, secrets, caching The GitHub Actions syntax you reach for most, in copy-ready blocks: event triggers and filters, build matrices, secrets and permissions, dependency caching… Intermediate · Cheat sheet · Any system Article GitHub Actions 15 Oct 2026
- 0397 PowerShell cheat sheet The PowerShell cmdlets and patterns you use every day: files, text, processes, services, filtering, exporting, remoting and the operators that trip up… Beginner · Cheat sheet · Linux, macOS, Windows Article PowerShell 15 Oct 2026
- 0346 The SSH config file: aliases, jump hosts and keys per server Reference for ~/.ssh/config: short names for servers, the right user, port and key per host, ProxyJump through a bastion, connection reuse and… Intermediate · Cheat sheet · Linux, macOS, Windows Article Keys & config · SSH 15 Oct 2026
- 0347 Port check script: test a list of host:port pairs with timeouts A bash script that tries a TCP connection to each host:port you give it, waits a few seconds at most, and reports… Beginner · Cheat sheet · Linux, macOS Script DNS, IP addresses & ports · Firewalls 15 Oct 2026
- 0348 DNS check script: compare answers from several resolvers A bash script that looks up one or more names against your system resolver and three public resolvers, shows each answer with… Beginner · Cheat sheet · Linux, macOS Script DNS, IP addresses & ports 15 Oct 2026
- 0358 SSH server audit script: print risky sshd settings A read-only bash script that asks sshd for its effective configuration, compares the important settings with safe values, flags config.d files that… Intermediate · Cheat sheet · Linux Script Server hardening · SSH 15 Oct 2026
- 0329 Docker CLI cheat sheet The Docker commands you reach for every day, grouped by what they act on: containers, images, volumes, networks, logs and cleanup, with… Beginner · Cheat sheet · Linux, macOS, Windows Article Docker basics 15 Oct 2026