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Ruby program to read lines from the existing file

Last Updated : December 15, 2025

Problem Solution

In this program, we will open an existing file using the File class in read ("r") mode. Then we will read an array of lines from an existing file using the readlines() method of the File class and print the result on the.

Program/Source Code

The source code to read lines from the existing file is given below. The given program is compiled and executed on Windows 10 Operating System successfully.

# Ruby program to read lines 
# from the existing file

# Open an existing file.
fobj = File.new("MyFile.txt", "r"); 

# Read the values as an array of lines.
print(fobj.readlines()); 

# Close file object
fobj.close();

Output

["Sample Text1\n", "Sample Text2\n", "Sample Text3\n", "Sample Text4"]

Explanation

In the above program, we opened an existing file "MyFile.txt" by creating object fobj of the File class. Then we read the array of lines from the "MyFile.txt" file using the readlines() method of the File class and printed the array. After that, we closed the open file.

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