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Ruby program to open a file in write-only mode

Last Updated : December 15, 2025

Problem Solution

In this program, we will open a file in write-only mode using File class in write ("w") mode. Then we will close the opened file.

Program/Source Code

The source code to open a file in write-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 
# write-only mode

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

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

# Write data into file
fobj.syswrite("Hello World\n");

# Close file object
fobj.close();  

Output

File opened in write-only mode.

Explanation

In the above program, we opened a file "MyFile.txt" in write-only mode ('w') by creating object fobj of the File class. Then we closed the opened file using the close() method.

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