131
votes

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.

44 Answers 44

84
votes

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)

2
  • 6
    Oh, so THAT site is why wget has a --mirror function... Thanks! Jun 25, 2009 at 19:25
  • 2
    You know you have all that info in /etc/services, right Ok no color but still, it's handy
    – niXar
    Jun 26, 2009 at 7:39
36
votes

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 http://locobox.googlepages.com/vi-vim-cheat-sheet.gif

4
  • a little frightened to ask, but do you have the qwerty?
    – Notmyfault
    Jun 25, 2009 at 23:41
  • The link is to the DVORAK but the image posted is for the QWERTY Jun 26, 2009 at 4:17
  • Sorry about that... ok, I added a link for the QWERTY version (now, both are there). Thanks for letting me know.
    – l0c0b0x
    Jun 26, 2009 at 5:05
  • Hm. I think i prefer not to have to use a cheat sheet for my text editor.
    – RCIX
    Nov 19, 2009 at 9:37
25
votes

Map of the internet

Source

4
  • 3
    I wonder what that looks like today. Jun 25, 2009 at 21:51
  • That's pretty cool!
    – Saif Khan
    Jun 27, 2009 at 14:32
  • @Martijn Heemels: As of Feb 2011, it's much less interesting - no more green squares, IPv4 fully allocated. Feb 8, 2011 at 15:15
  • I love the ~~~ wavey lines!
    – Alan
    Aug 4, 2011 at 14:09
24
votes

OpenSSH Quick Reference

OpenSSH Quick Reference PDF

0
22
votes

Protocol encapsulation chart from Wildpackets (PDF format)

Protocol encapsulation chart image

Just my 2 cents.

1
  • rlogin and rsh but no ssh? What is this, 1993?
    – Teddy
    Feb 1, 2010 at 14:19
15
votes

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

1
  • 2
    had to give it a +1
    – cop1152
    Jun 25, 2009 at 12:55
11
votes

Computer Hardware Chart (Geekologie):

Hardware Chart

2
10
votes

A while ago I found this helpful Linux/Unix Command Cheat Sheet.

Unix/Linux Command Reference

9
votes

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

9
votes

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

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

1
  • Am I happy to find this link! Jan 28, 2011 at 13:31
8
votes

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

8
votes

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...

2
7
votes

Not free, but definitely worth mentioning.
xkcd have a wearable Linux cheat sheet.

xkcd Linux cheat shirt

6
votes

Life's cheat sheet http://909sickle.com/s/lifes-cheat-sheet/lifes-cheat-sheet.png

Source

3
  • 8
    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, 2009 at 12:39
  • 1
    I think you'll have to ask the author about this... Don't shoot the messenger ;-)
    – fretje
    Jun 25, 2009 at 12:47
  • 4
    -1 (to the author) for spelling "marriage" incorrectly. Jun 25, 2009 at 21:31
6
votes

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.

5
  • The right link is: hyperionreactor.net/content/simple-raid-cheat-sheet
    – splattne
    Jun 25, 2009 at 12:19
  • I edited the answer with the correct link.
    – splattne
    Jun 25, 2009 at 12:20
  • It misses RAID-6, which is more and more common. And RAID-4, found in NetApp, DataDirect Networks and some other high-end products.
    – wazoox
    Jun 25, 2009 at 16:07
  • If you've got a cheat sheet that has those, I'll add it into my post.
    – phuzion
    Jun 25, 2009 at 16:50
  • The link appears to be broken again.
    – Zoredache
    Oct 13, 2009 at 21:30
5
votes

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.

0
5
votes

This regular expression cheat sheet in PDF format has been pretty helpful in the past.

4
votes

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.

2
  • Oh yes, I also use it when I have to deal with some exotic databases. Like Access ;-)
    – splattne
    Jul 7, 2009 at 13:50
  • Heh. Yeah, all my Access work is done out of pity.
    – squillman
    Jul 7, 2009 at 14:29
3
votes

Rewrite Rules Cheat Sheet

PECL Regex Cheat Sheet: PECL Cheat Sheet

3
votes

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:

2
votes

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

2
votes

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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