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Ruby program to open a file in append mode, open if the file does not exist

Last Updated : December 15, 2025

Problem Solution

In this program, we will open a file in append mode by specifying "a+" in the new() method, open if the file does not exist. Then we will write data into the end of the file.

Program/Source Code

The source code to open a file in append mode, open if the file does not exist is given below. The given program is compiled and executed on Windows 10 Operating System successfully.

# Ruby program to open a file in append mode,
# open if the file does not exist.

# Open file in read-write mode.
fobj = File.new("NewFile.txt", "a+"); 

print "File opened in append mode.\n";

# Write data into file at the end
fobj.syswrite("Noida\n");

# Close file object
fobj.close();  

# Open file in read mode.
fobj = File.new("NewFile.txt", "r"); 

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

# Read data from file
puts fobj.read();

# Close file object
fobj.close();  

Output

File opened in append mode.
File opened in read mode.
Noida

Explanation

In the above program, we opened a file "NewFile.txt" in append mode ('a+') by creating object fobj of the File class. The 'a+' mode is used, if the file does not exist. Then we wrote data into the file. After that, we read the updated file and printed the result.

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