Cheat sheets
One-page references for the commands, ports and admin pages you keep looking up. Made to print.
- Active Directory PowerShell cheat sheetActiveDirectory module cmdlets on one sheet: users, groups, computers and OUs, password resets and unlocks, finding locked, disabled and stale accounts, and -Filter versus -LDAPFilter.
- AI engineering cheat sheetBuilding with large language models in plain terms: the vocabulary, one API call, prompts that work, RAG, tools and agents, testing with evals, and the OWASP Top 10 for LLM applications.
- Bash cheat sheetEveryday Bash on one sheet: navigation, files and permissions with numeric chmod, grep, sort, uniq, sed and awk, processes, disk and memory, journalctl, redirection and a script skeleton.
- Common network ports cheat sheetThe well-known TCP and UDP ports an admin meets, from SSH, DNS and HTTPS to Kerberos, LDAP, SMB, RDP, WinRM, SQL and RADIUS, with a one-line use for each.
- Group Policy cheat sheetWhere common Group Policy settings live, from password, lockout and audit policy to drive maps, BitLocker and Windows Update, plus gpupdate, gpresult, LSDOU processing order and loopback.
- Microsoft 365 admin URLs cheat sheetCurrent web addresses for the Microsoft 365, Entra, Exchange, Intune, Defender, Purview, Teams, SharePoint and Power Platform admin centers, plus service health, Message center and handy direct pages.
- PowerShell cheat sheetEveryday PowerShell on one sheet: navigation, files, the object pipeline, variables, loops, services and processes, help, remoting and execution policy, with common aliases.
- Subnetting cheat sheetIPv4 subnetting by hand: the prefix and mask table, the block-size method, worked examples for finding a network, sizing for hosts, splitting a block and VLSM, plus the ranges and IPv6 basics worth knowing.