Open Directories and Read File Names

Perl Tutorials - Herong's Tutorial Examples

∟Open Directories and Read File Names

This chapter provides tutorial examples and notes about opening directories. Topics include using opendir() to open a directory handle for a given path name; using readdir() to read file names and sub directory names; using recursive methods to process all files of a directory tree.

opendir() - Open Directory to Read File Names

opendir.pl - Sample Program to Read Directories

DirTree.pl - Displaying the Directory Tree

DirGrep.pl - Searching Text in Directory Files

Takeaways:

opendir(DIR, $path) is a built-in subroutine to open a directory handle to a directory path.
readdir(DIR) is a built-in subroutine to read one entry or all entries from directory handle depending on the context.
A recursive method is needed to process all entries of a directory tree.
"DirGrep.pl pattern path" is an example script to search for text in a directory tree.

Table of Contents

About This Book

Perl on Linux Systems

Perl on macOS Computers

ActivePerl on Windows Systems

Data Types: Values and Variables

Expressions, Operations and Simple Statements

User Defined Subroutines

Perl Built-in Debugger

Name Spaces and Perl Module Files

Symbolic (or Soft) References

Hard References - Addresses of Memory Objects

Objects (or References) and Classes (or Packages)

Typeglob and Importing Identifiers from Other Packages

String Built-in Functions and Performance

File Handles and Data Input/Output

Open Files in Binary Mode

►Open Directories and Read File Names

File System Functions and Operations

Image and Picture Processing

Using DBM Database Files

Using MySQL Database Server

Socket Communication Over the Internet

XML::Simple Module - XML Parser and Generator

XML Communication Model

SOAP::Lite - SOAP Server-Client Communication Module

Perl Programs as IIS Server CGI Scripts

CGI (Common Gateway Interface)

XML-RPC - Remote Procedure Call with XML and HTTP

RPC::XML - Perl Implementation of XML-RPC

Integrating Perl with Apache Web Server

CGI.pm Module for Building Web Pages

LWP::UserAgent and Web Site Testing

Converting Perl Script to Executable Binary

CPAN (Comprehensive Perl Archive Network)

Archived Tutorials

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