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Ruby program to open a file in read-only mode

Last Updated : December 15, 2025

Problem Solution

In this program, we will open an existing file in read-only mode using the File class in read ("r") mode. Then we read and print data.

Program/Source Code

The source code to open a file in read-only mode is given below. The given program is compiled and executed on Windows 10 Operating System successfully.

# Ruby program to open a file 
# in read-only mode

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

print "File opened in read-only mode.\n";

# Read text from "MyFile.txt" file
print "File Text: \n",fobj.read();

# Close file object
fobj.close();

Output

File opened in read-only mode.
File Text:
Sample Text1
Sample Text2
Sample Text3
Sample Text4

Explanation

In the above program, we opened an existing file "MyFile.txt" in read-only mode ("r") by creating object fobj of the File class. Then we read and print data.

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