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Next Previous Contents BASH Programming - Introduction HOW-TO by Mike G mikkey at dynamo.com.ar Thu Jul 27 09:36:18 ART 2000 This article intends to help you to start programming basic-intermediate shell scripts. It does not intend to be an advanced document (see the title). I am NOT an expert nor guru shell programmer. I decided to write this because I'll learn a lot and it might be useful to other people. Any feedback will be apreciated, specially in the patch form :) 1. Introduction 1.1 Getting the latest version 1.2 Requisites 1.3 Uses of this document 2. Very simple Scripts 2.1 Traditional hello world script 2.2 A very simple backup script 3. All about redirection 3.1 Theory and quick reference 3.2 Sample: stdout 2 file 3.3 Sample: stderr 2 file 3.4 Sample: stdout 2 stderr 3.5 Sample: stderr 2 stdout 3.6 Sample: stderr and stdout 2 file 4. Pipes 4.1 What they are and why you'll want to use them 4.2 Sample: simple pipe with sed 4.3 Sample: an alternative to ls -l *.txt 5. Variables 5.1 Sample: Hello World! using variables 5.2 Sample: A very simple backup script (little bit better) 5.3 Local variables 6. Conditionals 6.1 Dry Theory 6.2 Sample: Basic conditional example if .. then 6.3 Sample: Basic conditional example if .. then ... else 6.4 Sample: Conditionals with variables 7. Loops for, while and until 7.1 For sample 7.2 C-like for 7.3 While sample 7.4 Until sample 8. Functions 8.1 Functions sample 8.2 Functions with parameters sample 9. User interfaces 9.1 Using select to make simple menus 9.2 Using the command line 10. Misc 10.1 Reading user input with read 10.2 Arithmetic evaluation 10.3 Finding bash 10.4 Getting the return value of a program 10.5 Capturing a commands output 10.6 Multiple source files 11. Tables 11.1 String comparison operators 11.2 String comparison examples 11.3 Arithmetic operators 11.4 Arithmetic relational operators 11.5 Useful commands 12. More Scripts 12.1 Applying a command to all files in a directory. 12.2 Sample: A very simple backup script (little bit better) 12.3 File re-namer 12.4 File renamer (simple) 13. When something goes wrong (debugging) 13.1 Ways Calling BASH 14. About the document 14.1 (no) warranty 14.2 Translations 14.3 Thanks to 14.4 History 14.5 More resources Next Previous Contents

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