Awk - A Tutorial and Introduction - by Bruce Barnett

KSH script BASICS Contents Principle of ScriptVariablesBranchingLoopingCommandline ArgumentsComparisonsVariable ManipulationsKsh Regular ExpressionsFunctionsData RedirectionPipesCoprocessesRead Input from User and from FilesSpecial VariablesAction on Success or Failure of a CommandTrivial CalculationsNumerical Calculations using "bc""grep""sed""awk""perl" Principle of Script Defining the Shell Type To make a ksh script (which is a ksh program) crate a new file with a starting line like:#! Four Types of Lines A script has four types of lines: The shell defining line at the top, empty lines, commentary lines starting with a # and command lines. #! Start and End of Script The script starts at the first line and ends either when it encounters an "exit" or the last line. Start and End of Command A command starts with the first word on a line or if it's the second command on a line with the first word after a";'. print -n "Name: "; read name; print "" Name and Permissions of Script File Variables Filling in Using Arrays ?

Famous Awk One-Liners Explained, Part I I noticed that Eric Wendelin wrote an article "awk is a beautiful tool." In this article he said that it was best to introduce Awk with practical examples. I totally agree with Eric. When I was learning Awk, I first went through Awk - A Tutorial and Introduction by Bruce Barnett, which was full of examples to try out; then I created an Awk cheat sheet to have the language reference in front of me; and finally I went through the famous Awk one-liners (link to .txt file), which were compiled by Eric Pement. This is going to be a three-part article in which I will explain every single one-liner in Mr. Eric Pement's Awk one-liner collection consists of five sections: The first part of the article will explain the first two sections: "File spacing" and "Numbering and calculations." I recommend that you print out my Awk cheat sheet before you proceed. These one-liners work with all versions of awk, such as nawk (AT&T's new awk), gawk (GNU's awk), mawk (Michael Brennan's awk) and oawk (old awk).

Sed - An Introduction and Tutorial Last modified: Mon Dec 2 16:50:13 2019 Table of Contents Note - You can click on the table of contents sections to jump to that section. Then click on the section header of any section to jump back to the table of contents. Copyright 1994, 1995 Bruce Barnett and General Electric Company Copyright 2001,2005,2007,2011,2013 Bruce Barnett All rights reserved You are allowed to print copies of this tutorial for your personal use, and link to this page, but you are not allowed to make electronic copies, or redistribute this tutorial in any form without permission. Original version written in 1994 and published in the Sun Observer Introduction to Sed How to use sed, a special editor for modifying files automatically. There are a few programs that are the real workhorse in the UNIX toolbox. One way to think of this is that the old, "classic" version was the basis of GNU, FreeBSD and Solaris verisons of sed. The Awful Truth about sed Sed is the ultimate stream editor. Anyhow, sed is a marvelous utility. .

man/man1/ksh.html man page Ksh is a command and programming language that executes commands read from a terminal or a file. Rksh is a restricted version of the command interpreter ksh; it is used to set up login names and execution environments whose capabilities are more controlled than those of the standard shell. Rpfksh is a profile shell version of the command interpreter ksh; it is used to to execute commands with the attributes specified by the user's profiles (see See Invocation below for the meaning of arguments to the shell. Definitions A metacharacter is one of the following characters: ; & ( ) | < > new-line space tab A blank is a tab or a space. A command is a sequence of characters in the syntax of the shell language. Commands A simple-command is a list of variable assignments (see Variable Assignments below) or a sequence of blank separated words which may be preceded by a list of variable assignments (see Environment below). A pipeline is a sequence of one or more commands separated by |.

Famous Awk One-Liners Explained, Part II This is the second part of a three-part article on the Awk one-liners. This part will explain Awk one-liners for text conversion and substitution. See part one for introduction of the series. "What are these famous Awk one-liners?", you might wonder? Well, they are concise and beautiful Awk programs that span no more than 70 characters (less than one terminal line). If you are intrigued by this article series, I suggest that you subscribe to my posts! Eric Pement's Awk one-liner collection consists of five sections: I recommend that you print out my Awk Cheat Sheet before you proceed. Awesome news: I have written an e-book based on this article series. Grab the local copy of Awk one-liners file here awk1line.txt and let's roll. 3. 21. awk '{ sub(/\r$/,""); print }' This one-liner uses the sub(regex, repl, [string]) function. The one-liner replaces '\r' (CR) character at the end of the line with nothing, i.e., erases CR at the end. 22. awk '{ sub(/$/,"\r"); print }' 23. awk 1 Ps. 24. tr -d \r

To SQL or NoSQL? That’s the database question Poke around the infrastructure of any startup website or mobile app these days, and you're bound to find something other than a relational database doing much of the heavy lifting. Take, for example, the Boston-based startup Wanderu. This bus- and train-focused travel deal site launched about three years ago. But why is that? Today, the database landscape continues to become increasingly complicated. The genesis of NoSQL In the beginning—about 12 years ago—there was structured data, and it was good. But that data was live, stored in operational systems like Enterprise Resource Planning (ERP) setups. SQL-based relational servers are built to handle the demands of financial transactions, designed around the tenets of ACID: Atomicity, Consistency, Isolation, and Durability. ACID, though, doesn't matter much when you're just reading data for analysis. How do you scale an Internet business to handle that? That setup is a little sloppy, and it wouldn't work for financial transactions. Hadoop

An Awk Primer < PREV | NEXT > | INDEX | SITEMAP | GOOGLE | LINKS | UPDATES | BLOG | EMAIL | $Donate? | HOME An Awk Primer v1.1.4 / TOC (3 chapters) / 01 apr 14 / greg goebel / public domain * The Awk text-processing programming language is a useful and simple tool for manipulating text. [1.0] A Guided Tour Of Awk [2.0] Awk Syntax [3.0] Awk Examples, Nawk, & Awk Quick Reference

Java vs. JavaScript So... what is the difference between Java and JavaScript anyway? They are both similar and quite different depending on how you look at them. First their lineage: Java is an Object Oriented Programming (OOP) language created by James Gosling of Sun Microsystems. You may be wondering what OOP means by now. Continuing with the model car example, when you built the engine, you didn't use any of the parts that would later build the seats (a 350 four-barrel engine with a seat belt sticking out if the piston would look pretty silly). The point is that in these languages, you build objects out of classes of commands to create the whole. Java and JavaScript are Still Two Different Animals Now let's talk about how Java and JavaScript differ. Another major difference is how the language is presented to the end user (that's you when you're surfing). JavaScript is text-based. The Benefits of JavaScript In my opinion, JavaScript's main benefit is that it can be understood by the common human. Enjoy!