Create and write to a file

Question

Challenge

Create a new file and write the string Hello World to it.

Restrictions

• Your challenge must write to a file on disk, in the file system.

• The file may not be a log file generated during normal operation of the interpreter.

• The file must contain only the string Hello World. It is allowed to contain a trailing newline or minimal whitespace. No other content.

• No command-line flags/pipes (etc) allowed, except when necessary to run the program. (e.g. perl -p)

Notes

• This is code-golf, so shortest program in bytes wins.

• Follow the spirit, not the letter, of the rules.

Answer 1

Nim, 28 26 bytes

"o".writeFile"Hello World"

Yes, Nim has a function in the system module for opening a file, writing a string to it, then closing it again.

Answer 2

JavaScript, 89 bytes

This code was tested in Chrome. In other browsers, the element must be in the document for the click method to work.

a=document.createElement("a");a.href="data:text/plain,Hello World";a.download=1;a.click()

Answer 3

HTML, 83 bytes

This code was tested in Chrome. It relies on the image failing to load, then it clicks itself, triggering the anchor tag which is a download link.

<a href="data:text/plain,Hello World" download><img src onerror="this.click()"></a>

Answer 4

C#, 118 112 98 bytes

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Golfed

void M(){var f=new FileInfo("_");var s=f.CreateText();s.Write("Hello World");s.Flush();s.Close();}

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Ungolfed

public void M() {
    var f = new FileInfo( "_" );
    var s = f.CreateText();

    s.Write( "Hello World" );
    s.Flush();
    s.Close();
}

---

Full explicit code

using System.IO;

namespace N {
    class C {
        public void M() {
            // A file name is required
            FileInfo f = new FileInfo( "_" );
            
            // Obtain the Stream to later write on it
            StreamWriter s = f.CreateText();

            // Write 'Hello World' to the Stream
            s.Write( "Hello World" );
            
            // Flush it to the file
            s.Flush();
            
            // Close the Stream, for security and integrity reasons.
            s.Close();
        }
    }
}

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Releases

• v1.2 - -14 bytes - Changed to vars. Shoutout to Jean Lourenço.
• v1.1 -  -6 bytes - Simplified names.
• v1.0 - 118 bytes - Initial solution.

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I'll leave a version down below that only uses the Console to write on th file. Just because I can.

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C# Console Version, 39 bytes

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Golfed

void M(){Console.Write("Hello World");}

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Ungolfed

public void M() {
    Console.Write("Hello World");
}

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Full code

using System;

namespace N {
    class C {
        public void M() {
            // Write 'Hello World' to the output handler
            Console.Write("Hello World");
        }
    }
}

---

Usage

<Exe. file name>.exe > FileToOutput.txt

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Releases

• v1.0 - 39 bytes - Initial solution.

Answer 5

Java

public class H
{
    public static void main(String[] a)
        throws IOException
    {
        FileWriter o = new FileWriter("x");
        o.write("Hello World");
        o.close();
    }
}

Simple I/O with no exception handling.

Corrected

Corrected the original code to write the correct string (Hello World).

Answer 6

Tcl, 28 bytes

puts [open T w] Hello\ World

Answer 7

Awk, 29 27 characters

BEGIN{print"Hello World">1}

(No, not another output redirection. Just Awk's syntax is similar.)

Thanks to:

• Pedro Maimere for suggesting to use integer for file name (-2 characters)

Sample run:

bash-4.3$ awk 'BEGIN{print"Hello World">1}'

bash-4.3$ cat 1
Hello World

Answer 8

R, 20 bytes

write("Hello World")

This creates a file named "data" in the current directory and write "Hello World" in it.

Answer 9

JavaScript (SpiderMonkey), ^{48 37 30} 29 bytes

open`data:text/t,Hello World`

Try it online!

Answer 10

AutoIT, 43 40 bytes

FileWrite(FileOpen("a",1),"Hello World")

Explanation

FileOpen takes two parameters and returns the handle of the file. Mode must be 1 for writing (appending) text.

FileOpen ( "filename" [, mode = 0] )

FileWrite takes two parameters, a handle and the text to write

FileWrite ( "filehandle/filename", "text/data" )

If a file does not exist, AutoIT will create it. Note that in my example it will not have any file extension associated (filename: a), but can still be opened with any text editor.

AutoIT is a Windows only scripting language.

Script-Example.com has an online AutoIT compiler that can verify the solution.

Answer 11

Php, 38 bytes

file_put_contents('a', 'Hello World');

Answer 12

Mathematica, 27 bytes

".txt"~Export~"Hello World"

Answer 13

Perl, 20 bytes

`echo Hello World>o`

Perl will execute anything in backticks (`) as a system command.

Answer 14

ListSharp, 37 bytes

OUTP="Hello World" HERE[<here>+"\\a"]

simply writes Hello World to a file called "a"(not even a text file) in the script execution environment,

Answer 15

PHP, 34 bytes

fputs(fopen(7,'c'),'Hello World');

Answer 16

PHP, 27 bytes

exec('echo Hello World>o');

PHP, 20 bytes

`echo Hello World>o`

Answer 17

C#, 50 bytes

s=>System.IO.File.WriteAllText("f","Hello World");

An anonymous function that takes in an unused argument and outputs the file.

Alternatively and cheating slightly this one:

s=>System.IO.File.WriteAllText("f",s);

That takes in a string and works assuming the string contains the text: Hello World, for 38 bytes.

Answer 18

Common Lisp, 69 bytes

Lauded for being incredibly expressive, it's not the best golfing language...

(with-open-file (f "f" :direction :output) (format f "Hello, world"))

See it work, with permission denied.

Answer 19

Bash script, 20 18 bytes

echo Hello World>o

Save this as a file write.sh and run it: `bash o.sh

Answer 20

Groovy, 28 characters

new File("o")<<"Hello World"

Sample run:

bash-4.3$ groovy -e 'new File("o")<<"Hello World"'

bash-4.3$ cat o
Hello World

Answer 21

Sed, 20 characters

(19 characters code + 1 character dummy input.)

s/^/Hello World/
wo

Seems the side effect of also displaying the string to STDOUT after the file was created is not prohibited.

Requires dummy input to work as per Are languages like sed exempt from “no input” rules?

Sample run:

bash-4.3$ sed $'s/^/Hello World/;wo' <<< ''
Hello World

bash-4.3$ cat o
Hello World

Answer 22

QBasic, 39 bytes

OPEN"f"FOR OUTPUT AS#1
?#1,"Hello World

Opens a file named f (creating it if it doesn't exist, wiping it if it does) and gives it the file handle #1. Then prints (?) to file #1 the string Hello World (with a trailing newline).

Answer 23

Jelly, 25 bytes

“ṠȷŀƤoĊịSAĊhJİⱮa¤XPṢḞɦ»ŒV

Try it online!

Executes the Python code open(*'aw').write('Hello World').