How do you create a file if it doesn't exist, and then append to it?

Question

ICSM Computer · Answer

The process of creating a file if it doesn't exist, and 
appending to it, depends on the language or environment you're using. Here's how it's done in a few popular ones:
C#
string filePath = "example.txt";
string content = "This is new content to append." + Environment.NewLine;
// This will create the file if it doesn't exist and append to it.
File.AppendAllText(filePath, content);
Python
with open("example.txt", "a") as file:
    file.write("This is new content to append.
")
# 'a' mode opens the file for appending, and creates it if it doesn't exist.
Java
import java.io.*;
try (FileWriter fw = new FileWriter("example.txt", true);
     BufferedWriter bw = new BufferedWriter(fw);
     PrintWriter out = new PrintWriter(bw)) {
    out.println("This is new content to append.");
} catch (IOException e) {
    e.printStackTrace();
}
Bash
echo "This is new content to append." andgt;andgt; example.txt
# 'andgt;andgt;' appends to the file and creates it if it doesn't exist.
Node.js (JavaScript)
const fs = require('fs');
const content = "This is new content to append.
";
fs.appendFileSync('example.txt', content, { encoding: 'utf8' });
// Automatically creates the file if it doesn't exist and appends to it.
and

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How do you create a file if it doesn't exist, and then append to it?

ICSM Computer

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1 Answers

C#

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Java

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Node.js (JavaScript)

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