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General Information

 o Eli: Translator Construction Made Easy
 o Global Index
 o Frequently Asked Questions


 o Quick Reference Card
 o Guide For new Eli Users
 o Release Notes of Eli
 o Tutorial on Name Analysis
 o Tutorial on Type Analysis

Reference Manuals

 o User Interface
 o Eli products and parameters
 o LIDO Reference Manual


 o Eli library routines
 o Specification Module Library

Translation Tasks

 o Lexical analysis specification
 o Syntactic Analysis Manual
 o Computation in Trees


 o LIGA Control Language
 o Debugging Information for LIDO
 o Graphical ORder TOol

 o FunnelWeb User's Manual

 o Pattern-based Text Generator
 o Property Definition Language
 o Operator Identification Language
 o Tree Grammar Specification Language
 o Command Line Processing
 o COLA Options Reference Manual

 o Generating Unparsing Code

 o Monitoring a Processor's Execution


 o System Administration Guide

Command Line Processing

Next Chapter Table of Contents

What is a command line interface?

When a processor is invoked it will be from an interactive or batch shell of some kind. A command line will be used to specify the name of the processor and any inputs that it needs. A few typical Unix command lines are:

cc -o fred.exe fred.c
vi fred.c
rlogin -l rms

Note that a pipe command such as:

format doc.troff | lpr -Plaser
consists of two command lines because two programs are invoked.

In these examples various options are given to some of the tools via the command line. For example, -o fred.exe specifies that the output file of the C compilation should be called fred.exe rather than the default a.out. A major part of the job of a command line interface is to provide mechanisms for specifying which options are legal and allowing the processor to find out which ones the user actually supplied.

Other information can be provided on the command line in the form of positional parameters. For example, fred.c in the first two examples and in the last are positional parameters. A command line interface is also responsible for providing access to positional parameters.

Unix provides access to the components of the command line for C programs via the argc and argv parameters to the main function. The facility described in this manual uses those parameters to provide higher-level access.

Next Chapter Table of Contents