Delete a file

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

In this task, the job is to delete a file called "input.txt" and delete a directory called "docs". This should be done twice: once "here", i.e. in the current working directory and once in the filesystem root.

Ada

<lang ada>with Ada.Directories; use Ada.Directories;</lang> and then <lang ada>Delete_File ("input.txt"); Delete_File ("/input.txt"); Delete_Tree ("docs"); Delete_Tree ("/docs");</lang> Naming conventions for the file path are OS-specific. The language does not specify the encoding of the file paths, the directory separators or brackets, the file extension delimiter, the file version delimiter and syntax. The example provided works under Linux and Windows.

ALGOL 68

Note: scratch does not appear to do anything on ALGOL 68G. Also note that file names are Operating System dependent.

main:(
  PROC remove = (STRING file name)INT: 
  BEGIN
    FILE actual file;
    INT errno = open(actual file, file name, stand back channel);
    IF errno NE 0 THEN stop remove FI;
    scratch(actual file); # detach the book and burn it #
    errno
  EXIT
  stop remove:
      errno
  END;
  remove("input.txt");
  remove("/input.txt");
  remove("docs");
  remove("/docs")
)

AutoHotkey

<lang AutoHotkey>FileDelete, input.txt FileDelete, \input.txt FileRemoveDir, docs, 1 FileRemoveDir, \docs, 1</lang>

AWK

Assuming we are on a Unix/Linux or at least Cygwin system: <lang awk> system("rm input.txt");

system("rm /input.txt");
system("rm -rf docs");
system("rm -rf /docs");</lang>

C

ISO C: <lang c>#include <stdio.h>

int main() {

 remove("input.txt");
 remove("/input.txt");
 remove("docs");
 remove("/docs");
 return 0;

}</lang>

POSIX: <lang c>#include <unistd.h>

int main() {

 unlink("input.txt");
 unlink("/input.txt");
 rmdir("docs");
 rmdir("/docs");
 return 0;

}</lang>

C++

<lang cpp>#include <cstdio>

1. include <direct.h>

int main() { remove( "input.txt" ); remove( "/input.txt" ); _rmdir( "docs" ); _rmdir( "/docs" );

return 0; }</lang>

C#

<lang csharp>using System; using System.IO;

namespace RosettaCode {

   class Program {
       static void Main() {
           try {
               File.Delete("input.txt");
               Directory.Delete("docs");
               File.Delete(@"\input.txt");
               Directory.Delete(@"\docs");
           } catch (Exception exception) {
               Console.WriteLine(exception.Message);
           }
       }
   }

}</lang>

Common Lisp

<lang lisp>(delete-file (make-pathname :name "input.txt")) (delete-file (make-pathname :directory '(:absolute "") :name "input.txt"))</lang> To delete directories we need an implementation specific extension. In clisp this is ext:delete-dir.

Works with: CLISP

<lang lisp>(let ((path (make-pathname :directory '(:relative "docs"))))

 (ext:delete-dir path))

(let ((path (make-pathname :directory '(:absolute "docs"))))

 (ext:delete-dir path))</lang>

Or you can use the portability library CL-FAD:

Library: CL-FAD

<lang lisp>(let ((path (make-pathname :directory '(:relative "docs"))))

 (cl-fad:delete-directory-and-files path))</lang>

D

Library: Tango

<lang d>import tango.io.Path;

void main() {

   remove("input.txt");
   remove("/input.txt");
   remove("docs");
   remove("/docs");

}</lang>

Library: Tango

POSIX: <lang d>import tango.stdc.posix.unistd;

void main() {

 unlink("input.txt");
 unlink("/input.txt");
 rmdir("docs");
 rmdir("/docs");

}</lang>

E

<lang e><file:input.txt>.delete(null) <file:docs>.delete(null) <file:///input.txt>.delete(null) <file:///docs>.delete(null)</lang>

Forth

There is no means to delete directories in ANS Forth.

 s" input.txt" delete-file throw
s" /input.txt" delete-file throw

Fortran

Works with: Fortran version 90 and later

I don't know a way of deleting directories in Fortran <lang fortran> OPEN (UNIT=5, FILE="input.txt", STATUS="OLD")  ! Current directory

CLOSE (UNIT=5, STATUS="DELETE")
OPEN (UNIT=5, FILE="/input.txt", STATUS="OLD")  ! Root directory
CLOSE (UNIT=5, STATUS="DELETE")</lang>

Haskell

<lang haskell> import System.IO

import System.Directory

main = do
  removeFile "output.txt"
  removeDirectory "docs"
  removeFile "/output.txt"
  removeDirectory "/docs"</lang>

Io

<lang io> Directory fileNamed("input.txt") remove

Directory directoryNamed("docs") remove
RootDir := Directory clone setPath("/")
RootDir fileNamed("input.txt") remove
RootDir directoryNamed("docs") remove</lang>

J

The J standard library comes with a set of file access utilities. <lang j> load 'files'

  ferase 'input.txt'
  ferase '\input.txt'
  ferase 'docs'
  ferase '\docs'

NB. Or all at once...

  ferase 'input.txt';'/input.txt';'docs';'/docs'

</lang>

The function above actually uses a foreign conjunction and defined in the files library like so: <lang j>NB. ========================================================= NB.*ferase v erases a file NB. Returns 1 if successful, otherwise _1 ferase=: (1!:55 :: _1:) @ (fboxname &>) @ boxopen </lang>

This means that you can directly erase files and directories without loading the files library. <lang j> 1!:55 <'input.txt'

  1!:55 <'\input.txt'
  1!:55 <'docs'
  1!:55 <'\docs'

</lang>

Java

<lang java>import java.util.File; public class FileDeleteTest {

  public static boolean deleteFile(String filename) {
      boolean exists = new File(filename).delete();
      return exists;
  }
  public static void test(String type, String filename) {
      System.out.println("The following " + type + " called " + filename + 
          (deleteFile(filename) ? " was deleted." : " could not be deleted.")
      );
  }
  public static void main(String args[]) {
       test("file", "input.txt");
       test("file", File.seperator + "input.txt");
       test("directory", "docs");
       test("directory", File.seperator + "docs" + File.seperator);
  }

}</lang>

Logo

Works with: UCB Logo

UCB Logo has no means to delete directories. <lang logo>erasefile "input.txt erasefile "/input.txt</lang>

MAXScript

There's no way to delete folders in MAXScript

-- Here
deleteFile "input.txt"
-- Root
deleteFile "\input.txt"

Objective-C

<lang objc>NSFileManager *fm = [NSFileManager defaultManager];

[fm removeFileAtPath:@"input.txt" handler:nil]; [fm removeFileAtPath:@"docs" handler:nil];</lang>

OCaml

<lang ocaml>Sys.remove "input.txt";; Sys.remove "/input.txt";;</lang>

with the Unix library: <lang ocaml>#load "unix.cma";; Unix.unlink "input.txt";; Unix.unlink "/input.txt";; Unix.rmdir "docs";; Unix.rmdir "/docs";;</lang>

Perl

<lang perl>use File::Spec::Functions qw(catfile rootdir);

1. here

unlink 'input.txt'; rmdir 'docs';

1. root dir

unlink catfile rootdir, 'input.txt'; rmdir catfile rootdir, 'docs';</lang>

Without Perl Modules

Current directory

perl -e 'unlink input.txt'
perl -e 'rmdir docs'

Root Directory

perl -e 'unlink "/input.txt"'
perl -e 'rmdir "/docs"'

PHP

<lang php><?php unlink('input.txt'); unlink('/input.txt'); rmdir('docs'); rmdir('/docs'); ?></lang>

PowerShell

<lang powershell># possible aliases for Remove-Item: rm, del, ri Remove-Item input.txt Remove-Item \input.txt # file system root

Remove-Item -Recurse docs # recurse for deleting folders including content Remove-Item -Recurse \docs</lang>

Python

<lang python>import os

1. current directory

os.remove("output.txt") os.rmdir("docs")

1. root directory

os.remove("/output.txt") os.rmdir("/docs")</lang>

R

<lang R>file.remove("input.txt") file.remove("/input.txt")

1. or

file.remove("input.txt", "/input.txt")

1. or

unlink("input.txt"); unlink("/input.txt")

1. directories needs the recursive flag

unlink("docs", recursive = TRUE) unlink("/docs", recursive = TRUE)</lang>

The function unlink allows wildcards (* and ?)

Raven

<lang raven> 'input.txt' delete

'/input.txt' delete
'docs'  rmdir
'/docs' rmdir</lang>

Ruby

<lang ruby> File.delete("output.txt", "/output.txt")

 Dir.delete("docs")
 Dir.delete("/docs")</lang>

Slate

(It will succeed deleting the directory if it is empty)

<lang slate>(File newNamed: 'input.txt') delete. (File newNamed: '/input.txt') delete. (Directory newNamed: 'docs') delete. (Directory newNamed: '/docs') delete.</lang>

Smalltalk

(It will succeed deleting the directory if it is empty)

<lang smalltalk>File remove: 'input.txt'. File remove: 'docs'. File remove: '/input.txt'. File remove: '/docs'</lang>

Standard ML

<lang sml>OS.FileSys.remove "input.txt"; OS.FileSys.remove "/input.txt"; OS.FileSys.rmDir "docs"; OS.FileSys.rmDir "/docs";</lang>

Tcl

<lang tcl>file delete input.txt /input.txt

1. preserve directory if non-empty

file delete docs /docs

1. delete even if non-empty

file delete -force docs /docs</lang>

Toka

 needs shell
 " docs" remove
 " input.txt" remove

UNIX Shell

<lang bash> rm -rf docs

rm input.txt
rm -rf /docs
rm /input.txt</lang>

Vedit macro language

Vedit allows using either '\' or '/' as directory separator character, it is automatically converted to the one used by the operating system. <lang vedit>// In current directory File_Delete("input.txt", OK) File_Rmdir("docs")

// In the root directory File_Delete("/input.txt", OK) File_Rmdir("/docs")</lang>

Visual Basic .NET

Platform: .NET

Works with: Visual Basic .NET version 9.0+

'Current Directory
IO.Directory.Delete("docs")
IO.Directory.Delete("docs", True) 'also delete files and sub-directories
IO.File.Delete("output.txt")

'Root
IO.Directory.Delete("\docs")
IO.File.Delete("\output.txt")

'Root, platform independent
IO.Directory.Delete(IO.Path.DirectorySeparatorChar & "docs")
IO.File.Delete(IO.Path.DirectorySeparatorChar & "output.txt")