Pattern matching is an important component of any modern shell. The ksh93 shell supports both regular expressions as well as what is called extended patterns. Extended patterns can be thought of as class or type of extended regular expressions. The purpose of this post is to explain, with some examples, how to use the power of extended patterns in your ksh93 scripts.
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This post demonstrates how to write a loadable stat builtin for Korn shell 93. Most Unix and GNU/Linux shells implement a flat variable namespace. Korn shell 93 implements a hierarchical variable namespace. This enabled the implementation of an aggregate definition for a shell variable to include subvariables called compound variables. This post tries to explain compound variables in some detail and demonstrate how useful they can be in when dealing with structured data. Korn Shell 93 is the only UNIX or GNU/Linux shell that I am aware of that, with proper setup, supports a modicum of per-user accounting and auditing. This post attempts to explain these facilities and show you how to access and manipulate the resulting accounting and auditing records. The Korn shell 93 exec command is a special overloaded built-in command that contains a number of very useful extensions relating to file descriptors and input/output which most shell programmers are unaware of. This post explains these extensions and shows examples of their use. |
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Copyright © 2005-2012 Finnbarr P. Murphy. All Rights Reserved. |
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