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devdaily.com directory : Perl : Articles and Tutorials : File IO

Directory : Perl : Articles and Tutorials : File IO

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CGI-101: Chapter 6: Reading and Writing Data Files - Covers opening and writing to files, file permissions, reading from files, and closing files. Includes source code for a sample CGI program that summarizes survey data.

CGI-101: Lesson 6: Simple Searching - Demonstrates how to search for data in a single text file using grep and split. Includes source code examples.

Deleting files in Perl - How to delete files using Perl, and a simple trick to recover files from a trash directory.

Learn how to open and read data files with Perl - Teaches the process of opening a text file for read access, and then demonstrates a simple way to read file contents.

Modifying data in a data file - A program for modifying records in a text database. Free source code.

Reading and writing to files on the server - The mechanisms used in to write data to the filesystem. Discusses file handles, open, read, write, append, flock(), locking files, and close.

Searching a data file - How to search a text file with Perl. Part two of a four-part series on building a text database.

Working with data files - The first part of a series that leads to a complete text-file database application.

Deleting records from a data file - Describes a procedure to delete records from a data file. Free source code.

How do I do fill_in_the_blank for each file in a directory? - Provides source code that demonstrates how to perform an operation for each file in a directory.

How do I generate a list of all .html files in a directory? - Demonstrates how to obtain a listing of all files in a directory ending with the filename extension '.html'.

How do I replace every character in a file with a comma? - Demonstrates how to replace every occurrence of one character (a character) with another character (a comma). Also shows how to edit the file in-place, so no file-renaming is required.

Multiplexing filehandles with select() in Perl - When writing network services, it's necessary to multiplex between several filehandles. This article demonstrates this process with Perl's select() function and the IO::Select module.

Using 'flock' in web-hit counters - Discusses how to use flock or lockf to keep multiple programs from trying to modify a file at the same time.