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Red Hat Enterprise Linux ( RHEL) is a Linux distribution produced by Red Hat and targeted toward the commercial market, including mainframes. Red Hat commits to supporting each version of RHEL for 7 years after its release. All of Red Hat’s official support, all of Red Hat’s training and the Red Hat Certification Program center on the Red Hat Enterprise Linux platform.

New versions of RHEL are released every 18 to 24 months. When Red Hat releases a new version of RHEL, customers may upgrade to the new version at no additional charge as long as they are in possession of a current subscription (e.g. the subscription term has not yet lapsed).

Link: http://www.linuxtopia.org/online_books/redhat_linux_step_by_step_guide/index.html

This manual was previously published under the title Red Hat Linux Getting Started Guide. It has been renamed and incorporated into the Red Hat Enterprise Linux documentation set. It has been modified to include new features in Red Hat Enterprise Linux 4 and to reflect changes in documented procedures that are not supported in Red Hat Enterprise Linux.

Popularity: 40% [?]

qmail is the #2 mail server on the planet. It was written by Daniel J. Bernstein as a more secure replacement for the popular Sendmail program. Life with qmail is one of the definitive documents for installing, configuring and using qmail. It contains a wealth of easy to follow information in a single page document. Besides the online HTML version, there there are PDF, postscript and ASCII versions.

Translations available in:

• Chinese
• Italian
• German
• Korean
• Polish
• Russian
• Spanish

Link: http://www.lifewithqmail.org/

Life with qmail is aimed at everyone interested in running qmail, from the rank amateur (newbie) who just installed Linux on a spare PC all the way up to the experienced system administrator or mail administrator. If you find it lacking or unclear, please let me know. Send comments to lwq@sill.org.

There’s a wealth of information available on qmail from a variety of sources. Some is targeted to newbies, some assumes that the reader is more experienced. Life with qmail is an attempt to "glue" this information into a single source, filling in some of the cracks and assuming only that the reader has basic skills such as:

• Manipulating files/directories under UNIX
• Operating a web browser or FTP client
• Following directions

Also available from this link is Life with qmail-ldap

qmail-ldap is a patch to qmail 1.03 to retrieve all user data from a ldap-directory rather then from files on the disk. This allows easier administration, especially in distributed environments. There is also clustering support builtin making qmail-ldap very well suited for big mail installations at ISPs.

Also available in print from this author:

The qmail Handbook

Popularity: 33% [?]

Link: http://qmail.3va.net/qdp/docs.html

This project was started to provide some extra documentation for Qmail, on top of the FAQ and man pages, to get the most out of the fast and secure MTA written by Daniel Bernstein.

Popularity: 32% [?]

Link: http://research.microsoft.com/%7Edaniel/unix-haters.html

Modern Unix is a catastrophe. It's the "Un-Operating System": unreliable, unintuitive, unforgiving, unhelpful, and underpowered. Little is more frustrating than trying to force Unix to do something useful and nontrivial. Modern Unix impedes progress in computer science, wastes billions of dollars, and destroys the common sense of many who seriously use it. An exaggeration? You won't think so after reading this book.

Popularity: 17% [?]

PostgreSQL is a powerful RDBMS with over 15 years of active development and proven architecture. It runs on all major Unix variants and Windows, is ACID compliant and supports most SQL92 and SQL99 data types. PostgreSQL has a very active development community.

Practical PostgreSQL covers everything from compiling, installing, using and administering a PostgreSQL server. The book also includes a full PostgreSQL command reference.

Link: http://www.commandprompt.com/ppbook/

PostgreSQL is an Object-Relational Database Management System (ORDBMS) that has been developed in various forms since 1977. It began as a project named Ingres at the University of California at Berkeley. Ingres itself was later developed commercially by Relational Technologies/Ingres Corporation.

Table of Contents

1. Preface
2. Introduction and Installation
3. Using PostgreSQL
4. Administrating PostgreSQL
5. Programming with PostgreSQL
6. PostgreSQL Command Reference
7. Appendixes
8. List of Tables (50)
9. List of Figures
10. List of Examples (380)

This book is also available in a paperback:

Practical PostgreSQL

Popularity: 9% [?]

A quick cheatsheet covering most of the most used VIm commands.

Link: http://www.worldtimzone.com/res/vi.html

Table of Contents:

1. Cursor movement
2. Insert Mode – Inserting/Appending text
3. Editing
4. Marking text (visual mode)
5. Visual commands
6. Cut and Paste
7. Exiting
8. Search/Replace
9. Working with multiple files

Popularity: 13% [?]