UNIX SHELL PROGRAMMING, FOURTH EDITION

Lowell Jay Arthur ; Ted Burns

Appendix X- The Shell Filter Builder

Lex is a very fast lexical analyzer. It can read files, intepret and transform them quickly. Lex is an ideal tool for building custom filters that can be used with the Shell.

Appendix Y- Nroff and Troff

Nroff and Troff are the old document processing language of UNIX Shell. Surprisingly, they are the basis of HTML-- Hypertext markup language for the Internet. For example, a heading level 1 in nroff (.h1) is similar to the HTML version H1. One way to format HTML documents for printing could be to run them through sed to create files for nroff:

                   cat html.doc | sed -e "s/H1/.h1/p" | nroff

Appendix Z- Regular Expressions

At the heart of all editing operations lie the Shell Regular Expressions. These expressions can help editing commands like ed, sed, and vi find and change all manner complex strings of data.

Links:

• Appendix X - The Shell Filter Builder
• Appendix Y - Nroff and Troff
• Appendix Y - Nroff and Troff - continued
• Appendix Z - Regular Expressions

ISBN 0471168947

Wiley Computer Publishing
Timely. Practical. Reliable.