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Google Globetrotting Woes

I am currently on the beautiful island of Cebu in the Philippines visiting with my old friend and colleague Charles Richmond at IISC and giving some talks on OS internals.  I use a Lenovo Thinkpad laptop running Windows Vista Ultimate when travelling with Mozilla Firefox 3 as my default browser. Firefox 3 comes with a default Search Bar on the top right hand corner containing a number of default search engines including Google. If I type a search term in the Google Search Bar option, Google figures out behind the scenes that I am located in the Philippines, redirects me

KSH93 Custom Builtins 1

The majority of GNU/Linux and Unix shells are not designed for extensibility or embeddability. The current exception is the 1993 version of the Korn Shell (ksh93) which includes support for runtime linking of libraries and custom builtins and accessing shell internals. It is very difficult, however, to find good information or examples of how to implement ksh93 custom builtins. The source code to ksh93 has virtually no comments and the supplied documentation is extremely terse and often conflicts with other sections of the documentation or the source code itself. This post is an attempt to show by example how to