Ruby File I/O

File I/O (Input/Output) is an important concept in programming. It refers to the way programs read files, and the way programs write files.

Syntax

The following is the syntax for opening a file in Ruby:

File.open("<filename>", "<mode>")

Here, filename is the name of the file you want to open, and mode is the mode in which you want to open the file. The mode parameter can take several values, such as:

• r - opens the file in read mode
• w - opens the file in write mode
• a - opens the file in append mode

Example

Here is an example of how to read a file in Ruby:

file = File.open("example.txt", "r")

puts file.read

file.close

Here, we open the file "example.txt" in read mode using the File.open method. Then, we use the read method to read the contents of the file. Finally, we close the file using the close method.

Output

When you run the above example, the output will be the contents of the "example.txt" file.

Explanation

The File.open method is used to open a file in Ruby. Once you have opened a file, you can read or write to it using various Ruby methods.

In the above example, we open the "example.txt" file in read mode using the File.open method. Then, we use the read method to read the contents of the file. Finally, we close the file using the close method.

Use

File I/O is used for a variety of tasks, such as:

• Reading data from a file
• Writing data to a file
• Creating a new file
• Deleting a file
• Renaming a file

Important Points

Here are some important points to keep in mind when working with file I/O in Ruby:

• Always make sure to close the file when you're done.
• Always check if the file exists before opening it.

Summary

File I/O is an essential part of programming, and it is used for reading and writing data to files. In Ruby, you can use the File.open method to open a file in different modes, and you can read or write to the file using various Ruby methods.