Write entire file

Write entire file
You are encouraged to solve this task according to the task description, using any language you may know.

Task

(Over)write a file so that it contains a string.

The reverse of Read entire file—for when you want to update or create a file which you would read in its entirety all at once.

11l

File(filename, ‘w’).write(string)

AArch64 Assembly

Works with: as version Raspberry Pi 3B version Buster 64 bits

/* ARM assembly AARCH64 Raspberry PI 3B */
/*  program writeFile64.s   */
 
/*******************************************/
/* Constantes file                         */
/*******************************************/
/* for this file see task include a file in language AArch64 assembly*/
.include "../includeConstantesARM64.inc"

/*********************************/
/* Initialized data              */
/*********************************/
.data
szMessErreur:  .asciz "Error open file.\n"
szMessErreur1: .asciz "Error close file.\n"
szMessErreur2: .asciz "Error write file.\n"
szMessWriteOK: .asciz "String write in file OK.\n"
 
szParamNom:    .asciz "./fic1.txt"      // file name
sZoneEcrit:    .ascii "(Over)write a file so that it contains a string."
               .equ LGZONEECRIT, . - sZoneEcrit
/*********************************/
/* UnInitialized data            */
/*********************************/
.bss  

/*********************************/
/*  code section                 */
/*********************************/
.text
.global main 
main:                         // entry of program 
                              // file open
    mov x0,AT_FDCWD           // current directory
    ldr x1,qAdrszParamNom     // filename
    mov x2,O_CREAT|O_WRONLY   //  flags
    ldr x3,oficmask1          // mode
    mov x8,OPEN               // Linux call system
    svc 0                     //
    cmp x0,0                  // error ?
    ble erreur                // yes
    mov x28,x0                // save File Descriptor
                              // x0 = FD
    ldr x1,qAdrsZoneEcrit     // write string address
    mov x2,LGZONEECRIT        // string size
    mov x8,WRITE              // Linux call system
    svc 0 
    cmp x0,0                 // error ?
    ble erreur2               // yes
                              // close file
    mov x0,x28                // File Descriptor
    mov x8,CLOSE              // Linuc call system
    svc 0 
    cmp x0,0                  // error ?
    blt erreur1
    ldr x0,qAdrszMessWriteOK
    bl affichageMess 
    mov x0,#0                 // return code OK
    b 100f
erreur:    
    ldr x1,qAdrszMessErreur
    bl affichageMess          // display error message
    mov x0,#1
    b 100f
erreur1:    
    ldr x1,qAdrszMessErreur1  // x0 <- adresse chaine 
    bl affichageMess          // display error message
    mov x0,#1                 // return code error
    b 100f    
erreur2:    
    ldr x0,qAdrszMessErreur2
    bl affichageMess          // display error message
    mov x0,#1                 // return code error
    b 100f
100:                          // program end
    mov x8,EXIT
    svc #0
qAdrszParamNom:            .quad szParamNom
qAdrszMessErreur:          .quad szMessErreur
qAdrszMessErreur1:         .quad szMessErreur1
qAdrszMessErreur2:         .quad szMessErreur2
qAdrszMessWriteOK:         .quad szMessWriteOK
qAdrsZoneEcrit:            .quad sZoneEcrit
oficmask1:                 .quad 0644         // this zone is Octal number (0 before) 
/********************************************************/
/*        File Include fonctions                        */
/********************************************************/
/* for this file see task include a file in language AArch64 assembly */
.include "../includeARM64.inc"

Action!

proc MAIN()
  open (1,"D:FILE.TXT",8,0)
  printde(1,"My string")
  close(1)
return

Ada

with Ada.Text_IO;  use Ada.Text_IO;

procedure Write_Whole_File is
   File_Name : constant String := "the_file.txt";

   F : File_Type;
begin
   begin
      Open (F, Mode => Out_File, Name => File_Name);
   exception
      when Name_Error => Create (F, Mode => Out_File, Name => File_Name);
   end;

   Put (F, "(Over)write a file so that it contains a string. "               &
           "The reverse of Read entire file—for when you want to update or " &
           "create a file which you would read in its entirety all at once.");
   Close (F);
end Write_Whole_File;

ALGOL 68

IF  FILE   output;
    STRING output file name = "output.txt";
    open( output, output file name, stand out channel ) = 0   
THEN
    # file opened OK #
    put( output, ( "line 1", newline, "line 2", newline ) );
    close( output )
ELSE
    # unable to open the output file #    
    print( ( "Cannot open ", output file name, newline ) )
FI

Arturo

contents: "Hello World!"
write "output.txt" contents

AutoHotkey

file := FileOpen("test.txt", "w")
file.Write("this is a test string")
file.Close()

AWK

# syntax: GAWK -f WRITE_ENTIRE_FILE.AWK
BEGIN {
    dev = "FILENAME.TXT"
    print("(Over)write a file so that it contains a string.") >dev
    close(dev)
    exit(0)
}

BaCon

String:

SAVE s$ TO filename$

Binary:

BSAVE mem TO filename$ SIZE n

BASIC

Applesoft BASIC

 10 D$ =  CHR$ (4)
 20 F$ = "OUTPUT.TXT"
 30  PRINT D$"OPEN"F$
 40  PRINT D$"CLOSE"F$
 50  PRINT D$"DELETE"F$
 60  PRINT D$"OPEN"F$
 70  PRINT D$"WRITE"F$
 80  PRINT "THIS STRING IS TO BE WRITTEN TO THE FILE"
 90  PRINT D$"CLOSE"F$

BASIC256

f = freefile
open f, "output.txt"
write f, "This string is to be written to the file"
close f

QBasic

Works with: FreeBASIC

f = FREEFILE
OPEN "output.txt" FOR OUTPUT AS #f
PRINT #f, "This string is to be written to the file"
CLOSE #

Run BASIC

Works with: QBasic

Works with: FreeBASIC

open "output.txt" for output as #1
print #1, "This string is to be written to the file"
close #1

True BASIC

OPEN #1: NAME "output.txt", CREATE NEWOLD
PRINT #1: "This string is to be written to the file"
CLOSE #1
END

BBC BASIC

file% = OPENOUT filename$
PRINT#file%, text$
CLOSE#file%

Bracmat

put$("(Over)write a file so that it contains a string.",file,NEW)

C

Dirty solution

/*
 * Write Entire File -- RossetaCode -- dirty hackish solution
 */
#define _CRT_SECURE_NO_WARNINGS  // turn off MS Visual Studio restrictions
#include <stdio.h>

int main(void)
{
    return 0 >= fputs("ANY STRING TO WRITE TO A FILE AT ONCE.", 
        freopen("sample.txt","wb",stdout));
}

Standard function fwrite()

/*
 * Write Entire File -- RossetaCode -- ASCII version with BUFFERED files
 */

#define _CRT_SECURE_NO_WARNINGS

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

/**
 *  Write entire file at once.
 *
 *  @param fileName file name
 *  @param data     buffer with data
 *  @param size     number of bytes to write
 *
 *  @return Number of bytes have been written.
 */
int writeEntireFile(char* fileName, const void* data, size_t size)
{
    size_t numberBytesWritten = 0; // will be updated

    // Notice: assertions can be turned off by #define NDEBUG
    //
    assert( fileName != NULL ); 
    assert( data != NULL );
    assert( size >  0 );

    // Check for a null pointer or an empty file name.
    //
    // BTW, should we write  if ( ptr != NULL)  or simply  if ( ptr )  ? 
    // Both of these forms are correct. At issue is which is more readable.
    //
    if ( fileName != NULL && *fileName != '\0' )
    {
        // Try to open file in BINARY MODE
        //
        FILE* file = fopen(fileName,"wb");

        // There is a possibility to allocate a big buffer to speed up i/o ops:
        //
        // const size_t BIG_BUFFER_SIZE = 0x20000; // 128KiB
        // void* bigBuffer = malloc(BIG_BUFFER_SIZE);
        // if ( bigBuffer != NULL )
        // {
        //     setvbuf(file,bigBuffer,_IOFBF,BIG_BUFFER_SIZE);
        // }
        //
        // Of course, you should release the malloc allocated buffer somewhere.
        // Otherwise, bigBuffer will be released after the end of the program.


        if ( file != NULL )
        {
            // Return value from fwrite( data, 1, size, file ) is the number
            // of bytes written. Return value from fwrite( data, size, 1, file )
            // is the number of blocks (either 0 or 1) written.
            //
            // Notice, that write (see io.h) is less capable than fwrite.
            //

            if ( data != NULL )
            {
                numberBytesWritten = fwrite( data, 1, size, file );
            }
            fclose( file );
        }
    }
    return numberBytesWritten; 
}

#define DATA_LENGTH 8192 /* 8KiB */

int main(void)
{
    // Large arrays can exhaust memory on the stack. This is why the static 
    // keyword is used.Static variables are allocated outside the stack.
    //
    static char data[DATA_LENGTH];
    
    // Filling data array with 'A' character. 
    // Of course, you can use any other data here.
    //
    int i;
    for ( i = 0; i < DATA_LENGTH; i++ )
    {
        data[i] = 'A';
    }

    // Write entire file at once.
    //
    if ( writeEntireFile("sample.txt", data, DATA_LENGTH ) == DATA_LENGTH )
        return EXIT_SUCCESS;
    else 
        return EXIT_FAILURE;
}

POSIX function write()

/*
 * Write Entire File -- RossetaCode -- plain POSIX write() from io.h
 */

#define _CRT_SECURE_NO_WARNINGS  // turn off MS Visual Studio restrictions
#define _CRT_NONSTDC_NO_WARNINGS // turn off MS Visual Studio restrictions

#include <assert.h>
#include <fcntl.h>
#include <io.h>

/**
 *  Write entire file at once.
 *
 *  @param fileName file name
 *  @param data     buffer with data
 *  @param size     number of bytes to write
 *
 *  @return Number of bytes have been written.
 */
int writeEntireFile(char* fileName, const void* data, size_t size)
{
    size_t numberBytesWritten = 0; // will be updated
    int file; // file handle is an integer (see Fortran ;)

    // Notice: we can not trust in assertions to work. 
    // Assertions can be turned off by #define NDEBUG.
    //
    assert( fileName ); 
    assert( data );
    assert( size >  0 );

    if(fileName && fileName[0] && (file=open(fileName,O_CREAT|O_BINARY|O_WRONLY))!=(-1))
    {
        if ( data ) 
            numberBytesWritten = write( file, data, size );
        close( file );
    }
    return numberBytesWritten; 
}

#define DATA_LENGTH 8192 /* 8KiB */

int main(void)
{
    // Large arrays can exhaust memory on the stack. This is why the static 
    // keyword is used.Static variables are allocated outside the stack.
    //
    static char data[DATA_LENGTH];
    
    // Filling data array with 'Z' character. 
    // Of course, you can use any other data here.
    //
    int i;
    for ( i = 0; i < DATA_LENGTH; i++ )
    {
        data[i] = 'Z';
    }

    // Write entire file at once.
    //
    if ( writeEntireFile("sample.txt", data, DATA_LENGTH ) == DATA_LENGTH )
        return 0;
    else 
        return 1;
}

C#

System.IO.File.WriteAllText("filename.txt", "This file contains a string.");

C++

#include <fstream>
using namespace std;

int main()
{
    ofstream file("new.txt");
    file << "this is a string";
    file.close();
    return 0;
}

Clojure

(spit "file.txt" "this is a string")

COBOL

       IDENTIFICATION DIVISION.
       PROGRAM-ID. Overwrite.
       AUTHOR. Bill Gunshannon. 
       INSTALLATION.  Home.
       DATE-WRITTEN.  31 December 2021.
      ************************************************************
      ** Program Abstract:
      **   Simple COBOL task.  Open file for output.  Write
      **     data to file. Close file.  Done...        
      ************************************************************
       
       ENVIRONMENT DIVISION.
       
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
            SELECT File-Name ASSIGN TO "File.txt"
                 ORGANIZATION IS LINE SEQUENTIAL.
       DATA DIVISION.
       
       FILE SECTION.
       
       FD  File-Name
           DATA RECORD IS Record-Name.
       01  Record-Name.
           02 Field1                  PIC X(80).
       
       WORKING-STORAGE SECTION.
       
       01 New-Val                   PIC X(80)
              VALUE 'Hello World'.
       
       
       PROCEDURE DIVISION.
       
       Main-Program.
           OPEN OUTPUT File-Name.
           WRITE Record-Name FROM New-Val.
           CLOSE File-Name.
           STOP RUN.
       
       END-PROGRAM.

Common Lisp

(with-open-file (str "filename.txt"
                     :direction :output
                     :if-exists :supersede
                     :if-does-not-exist :create)
  (format str "File content...~%"))

D

import std.stdio;

void main() {
    auto file = File("new.txt", "wb");
    file.writeln("Hello World!");
}

Delphi

Library: System.IoUtils

Translation of: C#

program Write_entire_file;

{$APPTYPE CONSOLE}

uses
  System.IoUtils;

begin
  TFile.WriteAllText('filename.txt', 'This file contains a string.');
end.

Elena

ELENA 4.x :

import system'io;
 
public program()
{
    File.assign("filename.txt").saveContent("This file contains a string.")
}

Elixir

File.write("file.txt", string)

F#

System.IO.File.WriteAllText("filename.txt", "This file contains a string.")

Factor

USING: io.encodings.utf8 io.files ;
"this is a string" "file.txt" utf8 set-file-contents

Forth

: >file ( string len filename len -- )
   w/o create-file throw dup >r write-file throw r> close-file throw ;

s" This is a string." s" file.txt" >file

Fortran

Where F is an integer with a value such as 10 (these days not being 5, standard input, nor 6, standard output), the I/O unit number. "REPLACE" means create the file if it does not exist, otherwise delete the existing file and create a new one of that name. The WRITE statement may present a single (large?) item, a list of items, and possibly there would be a series of WRITE statements if there is no need to do the deed via one WRITE only.

      OPEN (F,FILE="SomeFileName.txt",STATUS="REPLACE")
      WRITE (F,*) "Whatever you like."
      WRITE (F) BIGARRAY

Earlier Fortran might have other predefined unit numbers, for a card punch, paper tape, lineprinter, and so on, according to the installation. For a disc file, there may be no facility to name the file within Fortran itself as in the example OPEN statement because there may be no OPEN statement. Fortran IV used a DEFINE FILE statement, for example, which specified the record length and number of records in the file. As constants. File naming would instead be done by commands to the operating system when the prog. is started, as with the DD statement of JCL (Job Control Language) of IBM mainframes, and this would have its own jargon for NEW, OLD, REPLACE and what to do when the step finishes: DISP=KEEP, perhaps.

The OPEN statement started becoming standard with F77, but a READ or WRITE statement for a file could mix FORMAT style I/O with unformatted I/O - or indeed do both at once. This could be achieved via the An format code, which essentially states "unformatted" because it takes the variable's bit pattern "as is". Thus, a typical 32-bit floating-point variable occupies four bytes so it could be read or written with format code A4 and so on for other sizes. With declarations like REAL*8 X, Fortran programmers are usually well aware of storage sizes.

With F90, constraints were tightened - for our own good, supposedly. A file is opened with FORM="FORMATTED" by default, meaning that text is expected to be involved and all READ or WRITE statements must use the FORMAT facilities for that file. In the example, the * specifies free-format, which is not format free. Contrariwise, if the file is opened with FORM="UNFORMATTED" then the FORMAT facility must not be specified, as in the second WRITE of the example.

There is no particular limit on how much can be written in one go since no fixed record length has been specified, and indeed the text rolled forth via a variable may contain whatever character codes are desired, including CR, LF - but you will have to know whether the record separator is CR, CRLF, LFCR or CR, if you expect the file to be read later as a series of separate records. The output from each WRITE will be followed by the record separator (whichever it is) in the character interpretation in force, usually ASCII these days.

If instead FORM="UNFORMATTED" were specified in the OPEN statement you can still write whatever you wish, but now each output will not be followed by a record terminator. It is usual for such files to have a defined record length and reading or writing more than a record can hold is deemed an error. Previously (as with Fortran IV) the output (or input) would continue into however many successive records were needed. This was convenient when writing a large array of integers or floating-point, or indeed any list of such items. This would be useful when a complex data structure had been devised, and a simple statement with a short list would write the lot to a disc file, or read it back later. This would be far less trouble than working through its many details. One could go further and use EQUIVALENCE to overlay the pieces upon a large single array (called say THELOT) so that one need merely use WRITE(F) THELOT and likewise for reading. However keeping the equivalences correct when changes are made is troublesome. Instead, the data structure's collection of items could be placed in a COMMON work area and a STASH subroutine would for its COMMON statement merely declare an array THELOT of a suitable size without any mention of EQUIVALENCE. A somewhat similar arrangement is provided in pl/i via the BASED facility.

Option FORM="BINARY" does allow the reading or writing of however many records are needed to satisfy the I/O list, but, this is not a standard usage.

Free Pascal

See also: #Pascal

program overwriteFile(input, output, stdErr);
{$mode objFPC} // for exception treatment
uses
	sysUtils; // for applicationName, getTempDir, getTempFileName
	// also: importing sysUtils converts all run-time errors to exceptions
resourcestring
	hooray = 'Hello world!';
var
	FD: text;
begin
	// on a Debian GNU/Linux distribution,
	// this will write to /tmp/overwriteFile00000.tmp (or alike)
	assign(FD, getTempFileName(getTempDir(false), applicationName()));
	try
		rewrite(FD); // could fail, if user has no permission to write
		writeLn(FD, hooray);
	finally
		close(FD);
	end;
end.

FreeBASIC

' FB 1.05.0 Win64

Open "output.txt" For Output As #1
Print #1, "This is a string"
Close #1

Frink

w = new Writer["test.txt"]
w.print["I am the captain now."]
w.close[]

FutureBasic

void local fn SaveFile
CFStringRef fileString = @"The quick brown fox jumped over the lazy dog's back."
CFURLRef url = savepanel 1, @"Choose location to save file.", @"txt", @"Untitled", @"Save"
if (url)
  fn StringWriteToURL( fileString, url, YES, NSUTF8StringEncoding, NULL )
else
  // User canceled
end if
end fn

fn SaveFile

HandleEvents

Output:

Gambas

Public Sub Main()

File.Save(User.home &/ "test.txt", "(Over)write a file so that it contains a string.")

End

Go

import "io/ioutil"

func main() {
    ioutil.WriteFile("path/to/your.file", []byte("data"), 0644)
}

Groovy

 new File("myFile.txt").text = """a big string
that can be 
splitted over lines
"""

Haskell

main :: IO ( )
main = do
   putStrLn "Enter a string!"
   str <- getLine
   putStrLn "Where do you want to store this string ?"
   myFile <- getLine
   appendFile myFile str

J

   characters fwrite filename

or,

  characters 1!:2<filename

Java

import java.io.*;

public class Test {

    public static void main(String[] args) throws IOException {
        try (BufferedWriter bw = new BufferedWriter(new FileWriter("test.txt"))) {
            bw.write("abc");
        }
    }
}

Using Java 11

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;

public final class WriteEntireFile {

	public static void main(String[] aArgs) throws IOException {
		String contents = "Hello World";
		String filePath = "output.txt";
		
		Files.write(Path.of(filePath), contents.getBytes(), StandardOpenOption.CREATE);
	}

}

Julia

function writeFile(filename, data)
	f = open(filename, "w")
	write(f, data)
	close(f)
end

writeFile("test.txt", "Hi there.")

K

Works with: ngn/k

"example.txt" 0:"example file contents"

Kotlin

// version 1.1.2

import java.io.File

fun main(args: Array<String>) {
    val text = "empty vessels make most noise"
    File("output.txt").writeText(text)
}

Lingo

----------------------------------------
-- Saves string as file
-- @param {string} tFile
-- @param {string} tString
-- @return {bool} success
----------------------------------------
on writeFile (tFile, tString)
  fp = xtra("fileIO").new()
  fp.openFile(tFile, 2)
  err = fp.status()
  if not (err) then fp.delete()
  else if (err and not (err = -37)) then return false
  fp.createFile(tFile)
  if fp.status() then return false
  fp.openFile(tFile, 2)
  if fp.status() then return false
  fp.writeString(tString)
  fp.closeFile()
  return true
end

LiveCode

This will create a file "TestFile.txt" or overwrite it if it already exists. This is the shortest method for file I/O in LiveCode, but not the only method.

put "this is a string" into URL "file:~/Desktop/TestFile.txt"

Lua

function writeFile (filename, data)
	local f = io.open(filename, 'w')
	f:write(data)
	f:close()
end

writeFile("stringFile.txt", "Mmm... stringy.")

Maple

Export("directory/filename.txt", string);

Mathematica/Wolfram Language

Export["filename.txt","contents string"]

Nanoquery

import Nanoquery.IO

new(File, fname).create().write(string)

Nim

writeFile("filename.txt", "An arbitrary string")

Objeck

use System.IO.File;

class WriteFile {
  function : Main(args : String[]) ~ Nil {
    writer ← FileWriter→New("test.txt");
    leaving {
      writer→Close();
    };
    writer→WriteString("this is a test string");
  }
}

OCaml

let write_file filename s =
  let oc = open_out filename in
  output_string oc s;
  close_out oc;
;;

let () =
  let filename = "test.txt" in
  let s = String.init 26 (fun i -> char_of_int (i + int_of_char 'A')) in
  write_file filename s

Pascal

See also: Free Pascal

In Standard Pascal, a list of identifiers in the program header sets up a list of file handlers.

{$ifDef FPC}{$mode ISO}{$endIf}
program overwriteFile(FD);
begin
	writeLn(FD, 'Whasup?');
	close(FD);
end.

In some environments, it is the caller’s sole responsibility to invoke the program properly. I. e., the program above could be invoked on a Bourne-again shell in this fashion:

./overwriteFile >&- <&- 0>/tmp/foo # open file descriptor with index 0 for writing

Perl

The modern recommended way, is to use one of these CPAN modules:

use File::Slurper 'write_text';
write_text($filename, $data);

use Path::Tiny;
path($filename)->spew_utf8($data);

Traditional way, in case using CPAN modules is not an option:

open my $fh, '>:encoding(UTF-8)', $filename or die "Could not open '$filename':  $!";
print $fh $data;
close $fh;

Phix

without js -- (file i/o)
integer res = write_lines("file.txt",{"line 1\nline 2"})
if res=-1 then crash("error") end if

lines can also be {"line 1","line 2"} (note that a \n is appended to each line) or other multiline/triplequoted text.
See also open(), puts(), printf(), (neither of which add any \n), close(), temp_file(), create_directory()...

PHP

file_put_contents($filename, $data)

PicoLisp

(out "file.txt"
   (prinl "My string") )

Pike

Stdio.write_file("file.txt", "My string");

PowerShell

Writes all running process details to a file in the current directory.

Get-Process | Out-File -FilePath .\ProcessList.txt

PureBasic

EnableExplicit

Define fOutput$ = "output.txt" ; enter path of file to create or overwrite
Define str$ = "This string is to be written to the file"

If OpenConsole()
  If CreateFile(0, fOutput$)
    WriteString(0, str$) 
    CloseFile(0)   
  Else
    PrintN("Error creating or opening output file")
  EndIf
  PrintN("Press any key to close the console")
  Repeat: Delay(10) : Until Inkey() <> ""
  CloseConsole()
EndIf

Output (contents of 'output.exe'):

This string is to be written to the file

Python

with open(filename, 'w') as f:
    f.write(data)

Starting in Python 3.4, we can use pathlib to reduce boilerplate:

from pathlib import Path

Path(filename).write_text(any_string)
Path(filename).write_bytes(any_binary_data)

Racket

This only replaces the file if it exists, otherwise it writes a new file. Use 'truncate to overwrite the new contents into the existing file.

#lang racket/base
(with-output-to-file "/tmp/out-file.txt" #:exists 'replace
  (lambda () (display "characters")))

Raku

(formerly Perl 6)

spurt 'path/to/file', $file-data;

or

'path/to/file'.IO.spurt: $file-data;

RATFOR

# Program to overwrite an existing file

open(11,FILE="file.txt")
101 format(A)
write(11,101) "Hello World"
close(11)

end

REXX

version 1

/*REXX*/

of='file.txt'
'erase' of
s=copies('1234567890',10000)
Call charout of,s
Call lineout of
Say chars(of) length(s)

Output:

100000 100000

Output:

(first time use) using Regina REXX (among others) on a Windows or DOS system

Could Not Find c:\file.txt
100000 100000

version 2

This REXX version doesn't depend on any (operating system) host commands.

/*REXX program  writes  an  entire file  with a  single write  (a long text record).    */
oFID= 'OUTPUT.DAT'                               /*name of the output file to be used.  */
                                                 /* [↓]  50 bytes, including the fences.*/
$ = '<<<This is the text that is written to a file. >>>'
                                                 /* [↓]  COPIES  creates a 50k byte str.*/
call charout oFID, copies($,1000), 1             /*write the longish text to the file.  */
                                                 /* [↑]  the "1"  writes text ──► rec #1*/
                                                 /*stick a fork in it,  we're all done. */

Ring

write("myfile.txt","Hello, World!")

Ruby

The file is closed at the end of the block.

open(fname, 'w'){|f| f.write(str) }

Rust

use std::fs::File;
use std::io::Write;

fn main() -> std::io::Result<()> {
    let data = "Sample text.";
    let mut file = File::create("filename.txt")?;
    write!(file, "{}", data)?;
    Ok(())
}

Scala

import java.io.{File, PrintWriter}

object Main extends App {
  val pw = new PrintWriter(new File("Flumberboozle.txt"),"UTF8"){
  print("My zirconconductor short-circuited and I'm having trouble fixing this issue.\nI researched" +
    " online and they said that I need to connect my flumberboozle to the XKG virtual port, but I was" +
    " wondering if I also needed a galvanized tungsten retrothruster array? Maybe it'd help the" +
    " frictional radial anti-stabilizer vectronize from the flumberboozle to the XKG virtual port?")
  close()}
}

SenseTalk

put "New String" into file "~/Desktop/myFile.txt"

Sidef

With error handling:

var file = File(__FILE__)
file.open_w(\var fh, \var err) || die "Can't open #{file}: #{err}"
fh.print("Hello world!")       || die "Can't write to #{file}: #{$!}"

Without error handling:

File(__FILE__).open_w.print("Hello world!")

Smalltalk

Works with: Smalltalk/X

'file.txt' asFilename contents:'Hello World'

SPL

#.writetext("file.txt","This is the string")

Standard ML

fun writeFile (path, str) =
  (fn strm =>
    TextIO.output (strm, str) before TextIO.closeOut strm) (TextIO.openOut path)

Tcl

proc writefile {filename data} {
    set fd [open $filename w]   ;# truncate if exists, else create
    try {
        puts -nonewline $fd $data
    } finally {
        close $fd
    }
}

A more elaborate version of this procedure might take optional arguments to pass to fconfigure (such as encoding) or open (such as permissions).

TUSCRIPT

$$ MODE TUSCRIPT
content="new text that will overwrite content of myfile"
LOOP
 path2file=FULLNAME (TUSTEP,"myfile",-std-)
 status=WRITE (path2file,content)
 IF (status=="OK") EXIT
 IF (status=="CREATE") ERROR/STOP CREATE ("myfile",seq-o,-std-)
ENDLOOP

VBA

Option Explicit

Const strName As String = "MyFileText.txt"
Const Text As String = "(Over)write a file so that it contains a string. " & vbCrLf & _
           "The reverse of Read entire file—for when you want to update or " & vbCrLf & _
           "create a file which you would read in its entirety all at once."

Sub Main()
Dim Nb As Integer

Nb = FreeFile
Open "C:\Users\" & Environ("username") & "\Desktop\" & strName For Output As #Nb
    Print #1, Text
Close #Nb
End Sub

VBScript

Text file created or overwritten in the same folder as the script.

Set objFSO = CreateObject("Scripting.FileSystemObject")

SourceFile = objFSO.GetParentFolderName(WScript.ScriptFullName) & "\out.txt"
Content = "(Over)write a file so that it contains a string." & vbCrLf &_
		"The reverse of Read entire file—for when you want to update or create a file which you would read in its entirety all at once."
		
With objFSO.OpenTextFile(SourceFile,2,True,0)
	.Write Content
	.Close
End With

Set objFSO = Nothing

Visual Basic .NET

Translation of: C#

Module Module1

    Sub Main()
        My.Computer.FileSystem.WriteAllText("new.txt", "This is a string", False)
    End Sub

End Module

V (Vlang)

import os

os.write_file('./hello_text.txt', 'Hello there!') or {println('Error: failed to write.') exit(1)}

Wren

The easiest way to overwrite a file in Wren is to 'create' it again which truncates the existing contents.

import "io" for File

// create a text file
File.create("hello.txt") { |file|
    file.writeBytes("hello")
}

// check it worked
System.print(File.read("hello.txt"))

// overwrite it by 'creating' the file again
File.create("hello.txt") {|file|
    file.writeBytes("goodbye")
}

// check it worked
System.print(File.read("hello.txt"))

Output:

hello
goodbye

XLISP

(define n (open-output-file "example.txt"))
(write "(Over)write a file so that it contains a string." n)
(close-output-port n)

XPL0

[FSet(FOpen("output.txt", 1), ^o);
Text(3, "This is a string.");
]

Xtend

package com.rosetta.example

import java.io.File
import java.io.PrintStream

class WriteFile {
    def static main( String ... args ) {
        val fout = new PrintStream(new File(args.get(0)))
        fout.println("Some text.")
        fout.close
    }
}

Yabasic

open "output.txt" for writing as #1
print #1 "This is a string"
close #1

zkl

      // write returns bytes written, GC will close the file (eventually)
File("foo","wb").write("this is a test",1,2,3); //-->17

f:=File("bar",wb");
data.pump(f,g); // use g to process data as it is written to file
f.close();  // don't wait for GC