Command Language Overview

Prerequisites

Introduction

The most important utility is the command processor, which usually is an interpreter for a command language of some kind (procedural, graphical, etc). Command languages are distinguished by the level of object they operate on: files and processes. They also have the typical constructs of programming languages: variables, conditionals and loops.

These are

• bash - a Unix shell
• command.com - the MSDOS shell
• ls, rm - Unix utilities working on files
• awk, perl - string processing languages
• sed - a string processing utility
• C, Ada - languages that work on machine-level entities such as bytes, characters, integers, floats.
• tr - a Unix utility that translates characters
• bc - a desk calculator working on numbers

Contents

• Generic Operations
• Unix Shell - bash
• Additional utilities
• Regular expressions

Outcomes

Program Development using Unix Home