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Full Discussion: "let" in BASH
Top Forums Shell Programming and Scripting "let" in BASH Post 302915039 by Perderabo on Saturday 30th of August 2014 11:01:41 PM
Old 08-31-2014
The "let" command originated in ksh. Dave Korn considered it to be a mistake and very quickly developed the double parentheses notation to replace it. By the mid 1980's the advice was to not use the "let" command in new code. However the let command is still available. It is intended for legacy code. bash copied ksh arithmetic including both the double parentheses and the "let" command. And the bash team followed Dave's lead in not recommending the "let" command.

I started using ksh in the late 80's. The "let" command had been deprecated for several years even back then. I have been writing ksh scripts form over a quarter of a century. I don't believe that I have ever used "let". I don't believe that I ever will.
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LEARN ABOUT DEBIAN

books

books(3)							       Coin								  books(3)

NAME

       books - Books Related to Open Inventor / Coin Here is a list of some of the better books for people that invested in software development
       with Open Inventor. If you have suggestions for additional books that ought to go on this list, please feel free to tell us about it.

The Inventor Mentor
       (subtitle 'Programming Object-Oriented 3D Graphics with Open Inventor')

       This is an excellently written, detailed, tutorial-style introductory book for Open Inventor that takes you through all the fundamental
       design principles applied in the Open Inventor API, richly illustrated and with numerous, well documented code examples.

       The Inventor Mentor is getting a bit old, but do not let that put you off. It is as valid today as it was the day it was written, and we
       heartily recommend this book for anyone learning to use Open Inventor.

       ISBN 0-201-62495-8. You might also be able to find this book as a pdf file online, but we recommend having it in print.

The Inventor Toolmaker
       This book explains how Open Inventor was designed for being extended by the users, and walks you through how to develop your own components
       that work with all aspects of Coin.

       ISBN 0-201-62493-1. You might also be able to find this book as a pdf file online, but we recommend having it in print.

The Annotated VRML2.0 Reference Manual
       This book covers the VRML97 (aka VRML 2.0) standard, which Coin has implemented with its Inventor/VRMLnodes/* classes, which is an
       extension made beyond the Open Inventor V2.1 API.

       The VRML97 format has some significant differences from the Inventor and VRML1 formats, so it is a useful book if you want to use that part
       of Coin.

       ISBN 0-201-41974-2. You will find the specification documents for VRML97 online at http://www.web3d.org/.

The Open GL Programming Manual
       This is the bible when it comes to OpenGL programming and is relevant for Open Inventor extenders that develop new nodes that implement or
       affect Open Inventor OpenGL rendering. There are many editions of this book since it is updated whenever new versions of OpenGL are
       standardized and comes out, so check that you have identified the latest edition if you order one.

The Open Inventor C++ Reference Manual
       Although this book is directly relevant for Open Inventor, it does only cover the Open Inventor 2.1 API. This information is more or less
       also covered in the online doxygen doc for Coin, where you have it hyperlinked, and can also be generated offline from the Coin sources to
       have locally, so we do not think this book is very useful to have in print. We mention it anyway since it is an official documentation book
       for Open Inventor.

       ISBN 0-201-62491-5.

Version 3.1.3							  Wed May 23 2012							  books(3)
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