I'm a programmer of computers who can't help but tinker with them every chance I get.

Try clearing the Help caches. Probably the easiest way is via the free OnyX app.

Quit Help, then select the Maintenance icon in the OnyX toolbar, then the Rebuild tab. Towards the bottom, check (only) the Help Viewer menu box.

It is big topic but many of the services on Lion server are reliant on having OD user not local user accounts.

We're Linux Consultants. We solve Linux problems.

As System Administrators and Developers we know Linux inside and out, from the kernel to drivers, from Web databases to firewalls. With extensive experience in Python, qmail, Security, and Network Administration, we bring real world answers to your data center.

One of our largest clients is a web services company which serves up over 10 million 'hits' a day. We've helped them to significantly increase both throughput and reliability. We like big challenges that we can sink our teeth into.

Based in Fort Collins, Colorado, tummy.com has experienced, reliable, friendly Linux experts ready to help you solve your Linux problems.

a full-featured file system for online data storage

This is a personal webspace of Mike Kazantsev.

I'm a software developer and sysadmin, usually working (both for employer and in my spare time) with free and open source software, networks and the web.

A Bourne Shell Programming/Scripting Tutorial for learning about using the Unix shell. Learn Linux / Unix shell scripting by example along with the theory. We'll have you mastering Unix shell scripting in no time! Available right here on the World Wide Web.

A detailed list of steps you can take to secure access to your server via SSH (secure shell).

Modern Linux installations ship with many of these security options enabled by default, but there are a lot of tips and tools worth investigating, like DenyHosts.

Press C during startup Start up from a bootable CD or DVD, such as the Mac OS X Install disc that came with the computer.
Press D during startup Start up in Apple Hardware Test (AHT).
Press Option-Command-P-R until you hear startup sound a second time. Reset NVRAM
Press Option during startup Start up in Startup Manager, where you can select a Mac OS X volume to start from. Note: Press N to make the the first bootable Network volume appear as well.
Press Eject, F12, or hold the mouse or trackpad button Ejects any removable media, such as an optical disc.
Press N during startup Attempt to start up from a compatible network server (NetBoot).
Press T during startup Start up in Target Disk Mode.
Press Shift during startup Start up in Safe Boot mode and temporarily disable login items.
Press Command-V during startup Start up in Verbose mode.
Press Command-S during startup Start up in Single-User mode.
Press Option-N during startup Start from a NetBoot server using the default boot image.
Press Command-R during startup
Start from Lion Recovery1

OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on

umich IT instructions

Creating a public/private key pair

Well known TCP and UDP ports used by Apple software products

Ryan Faas, updating his highly popular article from 2007, evaluates some of the best tools for analyzing and repairing problems with Mac hard drives and directory structures.

With Mac OS X Server version 10.5, you can store network Time Machine backups on both internal and external hard drives.

Takeaway: Not everyone who supports Macs in the enterprise is a Mac expert. This step-by-step installation guide includes tips and recommendations for the download-only upgrade to Mac OS X Lion.

When you look at the worst corporate security breaches, it's clear that network managers keep making the same mistakes over and over again, and that many of these mistakes are easy to avoid.

Mactracker provides detailed information on every Apple Macintosh computer ever made, including items such as processor speed, memory, optical drives, graphic cards, supported Mac OS versions, and expansion options. Also included is information on Apple mice, keyboards, displays, printers, scanners, digital cameras, iPod, Apple TV, iPhone, iPad, Wi-Fi Cards/Base Stations, Newton, and Mac OS versions.

Splunk is the world’s leading software used to monitor, report and analyze live streaming IT data as well as terabytes of historical data – located on-premises or in the cloud. More than 1,850 organizations in 70 countries use Splunk to gain valuable insights from their IT data to improve service levels, reduce IT operations costs, mitigate security risks, and drive new levels of operational visibility.

This is a browser for the reference document of Cocoa API. You need to install Apple's developer tools.

An heuristic approach. Revised and augmented from the original by Auntie Sydney and Uncle Rick.

Never run unknown and untrusted software, goes the Apple mantra. Yet that seems to be an impossible proposition. For how can you ever get to know and trust something if you never run it?

Theocacao is written by me, Scott Stevenson. I was born in the San Francisco Bay Area, though I lived the first three years of my life in London. I now live in Sunnyvale, California.

I run Cocoa Dev Central and Cocoa Blogs, which help programmers learn how to write software for the Mac.

I own a tiny company called Tree House Ideas, which published the DataCrux framework. DataCrux provided a high-level interface to SQLite, and was used to create several Mac apps, including MemoryMiner, LogTen, and Mindburn.

I created the MacNN logo and basic corporate identity, which features the yellow and white text on blue, the zoom tool icon, and the tagline "Read Me First."

I co-founded a web development company called Maxify in 1996. We did work for a bunch of Bay Area companies, and created AltaVista's first company-wide intranet. I was interviewed in 1999 for my work at Maxify during an hour-long CNN special on Silicon Valley.

For better or worse, I don't have formal training for any of this.

I’m current working as a sysadmin for Google in Mountain View on Mac and Linux stuff.
given that… this is my personal blog. The views expressed on these pages are mine alone and not those of my employer.
Before that I spent the best part of a decade being a sysadmin for users who were academics and artists in Sydney, Australia

Trials and Tribulations of an OS X Administrator

Mac OS X Server
Introduction to Command-Line Administration
Version 10.6 Snow Leopard

'Never run unknown and untrusted software', goes the Apple mantra and as defensible as it seems it's not particularly logical. Not superficially. Bad software can at any time wreak havoc on a computer; if you've never run a program before there's very little you can do to prevent mishaps and deliberate destruction.

df du UFS ZFS
As a SA, it not uncommon to have regularly requests about big differences between the du and df outputs on a UFS file system.

Welcome to appleserialnumberinfo.com, here you can lookup info about your Mac based on just your serial number. Find out specs, warranty information, repair programs, reported issues and more.

radmind - A suite of Unix command-line tools and a server designed to remotely administer the file systems of multiple Unix machines. For Mac OS X, there's also a graphical interface.

Jeff Johnson
I'm a developer and administrator of Vienna, an open source feed reader for Mac OS X.

I'm also a software engineer for Rogue Amoeba Software.

GeekTool is a PrefPane (System Preferences module) for Mac OS 10.5. It let you display on your desktop different kind of informations, provided 3 default plugins : File, Shell, Image

GeekTool's PC equivalent, Samurize.

Samurize is an advanced system monitoring and desktop enhancement engine for Windows 2000/XP/2003/Vista

for mac: geektool

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.

Redmine is open source and released under the terms of the GNU General Public License v2 (GPL).

Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices.