How to Open a File in Read and Write Mode in Perl

Learn how to open a file in read and write mode in Perl, enabling simultaneous reading from and writing to the file within your Perl scripts. Explore Perl's file handling capabilities for efficient data manipulation.
---
Disclaimer/Disclosure: Some of the content was synthetically produced using various Generative AI (artificial intelligence) tools; so, there may be inaccuracies or misleading information present in the video. Please consider this before relying on the content to make any decisions or take any actions etc. If you still have any concerns, please feel free to write them in a comment. Thank you.
---
In Perl, opening a file in read and write mode allows you to simultaneously read from and write to the file within your script. This can be useful for various tasks such as updating existing data or creating new content based on the existing file contents.

To open a file in read and write mode in Perl, you can use the +< mode specifier when calling the open() function. Here's a basic example:

[[See Video to Reveal this Text or Code Snippet]]

In the example above:

The open() function returns a file handle, which is used to interact with the file.

We use a while loop to read each line from the file and process its content.

To write to the file, simply use the file handle as you would with any other file opened for writing.

Finally, remember to close the file handle using the close() function to release system resources.

Keep in mind that opening a file in read and write mode requires proper file permissions, and the file must exist prior to opening it in this mode. If the file does not exist, an error will occur.

With Perl's file handling capabilities, you can efficiently manipulate data within files, whether it's reading, writing, or updating content, providing flexibility for various scripting tasks.