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I'd like to start a collection of good, free cheat sheet resources for system administrators. Please add your favorite ones. From the Wikipedia "cheat sheet" article:

In more general usage, a "cheat sheet" is any short (one or two page) reference to terms, commands, or symbols where the user is expected to understand the use of such terms etc but not necessarily to have memorized all of them.

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I add my own favorite: Cheat Sheets on PacketLife.com has some very nice ones on network technology topics.

Cheat sheets are in PDF format. You are welcome to use and redistribute them as you please, so long as they remain intact and unmodified.

Currently there are six categories:

  • Protocols: BGP, EIGRP, First Hop Redundancy, IEEE 802.11 Wireless, IEEE 802.1X, IPsec, IPv4 Multicast, IPv6, IS-IS, OSPF, Spanning Tree
  • Applications: tcpdump, Wireshark Display Filters
  • Reference: Common Ports, IP Access Lists, Subnetting
  • Syntax: Markdown, MediaWiki
  • Technologies: MPLS, Quality of Service, VLANs
  • Miscellaneous: Cisco IOS Versions, Physical Terminations

Examples: Common Ports and IPv6 (links to PDF files)

Common Ports Cheat Sheet (PDF)

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Oh, so THAT site is why wget has a --mirror function... Thanks! –  Matt Simmons Jun 25 '09 at 19:25
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You know you have all that info in /etc/services, right Ok no color but still, it's handy –  niXar Jun 26 '09 at 7:39
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I wish to use this at some point... for now though, I'm a nano dork but thought it might be handy for some here:

Printable (PDFs)

QWERTY:http://locobox.googlepages.com/vi-vim-cheat-sheet-qwerty.pdf Dvorak:http://locobox.googlepages.com/vi-vim-cheat-sheet-dvorak.pdf

alt text

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Map of the internet

Source

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I wonder what that looks like today. –  Martijn Heemels Jun 25 '09 at 21:51
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OpenSSH Quick Reference

OpenSSH Quick Reference PDF

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Google.com (I know - it's not a list with two-word commands, but it saves my behind every time).

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had to give it a +1 –  cop1152 Jun 25 '09 at 12:55
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Nice Windows 2008 technology posters available here:

Windows Server 2008 Component Posters

  • Windows Server 2008 Feature Components
  • Windows Server 2008 Active Directory Components

These two posters, originally published in the July 2007 issue of TechNet Magazine, provide a strong visual tool to aide in the understanding of various features and components of Windows Server 2008. One poster focuses exclusively on powerful new Active Directory technologies, while the other provides a technical look at a variety of new features available in Windows Server 2008 (such as Server Core, Network Access Protection, and more).

Windows Server 2008 PDF Posters

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And a list with cheat sheets for different languages, systems and so on.

http://www.cheat-sheets.org/

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SQL Server Cheat Sheet

The SQL Server cheat sheet is a one-page A4 printable document, designed to provide a quick reference for SQL Server. A description of what is on the cheat sheet follows, or if you are impatient, you can go straight to the full size SQL Server cheat sheet.

  • Data Types and Conversion
  • Functions
  • Creations

SQL Server Data Types and Conversion

Download link: PDF file

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Windows 2003 Command Line Reference is more of a 50 lb manual than a cheat sheet, though if someone has something lightweight with the compressed syntax, that would rock...

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Life's cheat sheet

Source

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your math doesn't add up here. you are born -1000 then going the job route you get +1000. Unless I missed something or this is some new age math stuff I thought -1000 + 1000 = 0. And then you get taxed on the 1000 that you earned so you really have -1. Am I missing something. –  TechGuyTJ Jun 25 '09 at 12:39
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I think you'll have to ask the author about this... Don't shoot the messenger ;-) –  fretje Jun 25 '09 at 12:47
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-1 (to the author) for spelling "marriage" incorrectly. –  Dennis Williamson Jun 25 '09 at 21:31
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Simple RAID Cheat Sheet

I'm sure it's just because I don't mess with RAID that often, but when I do need it, this is immensely helpful.

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Unix Toolbox

This document is a collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users. This is a practical guide with concise explanations, however the reader is supposed to know what s/he is doing.

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http://www.connectionstrings.com

I use it all the time for system administrator and developer related tasks, especially when trying to make an applications talk to a database other than what it was originally designed for and the support isn't all that great.

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Rewrite Rules Cheat Sheet

PECL Regex Cheat Sheet: PECL Cheat Sheet

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As an admin (and after) I find that I need to often create tools for the browser.

I'm not a designer (nor do I desire to be one), but I have found VisiBone cheat sheets immensely helpful:

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I created a Vim cheatsheet in various formats a couple of years ago: Vim Cheatsheet

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Found this whimpy list of links to various sheets for various technologies...there's only, oh, I dunno, three dozen of these...

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