Create a file

In this task, the job is to create a new empty file called "output.txt" of size 0 byte and an empty directory called "docs". This should be done twice: once "here", i.e. in the current working directory and once in the filesystem root.

D

For file creation, std.file.write function & std.stream.file class are used.
For dir creation, std.file.mkdir is used.

module fileio ;
import std.stdio ;
import std.path ;
import std.file ;
import std.stream ;

string[] genName(string name){
  string cwd  = curdir ~ sep ; // on current directory
  string root = sep ;          // on root 
  name = std.path.getBaseName(name) ;  
  return [cwd ~ name, root ~ name] ;
}
void Remove(string target){
  if(exists(target)){
    if (isfile(target)) 
      std.file.remove(target);
    else
      std.file.rmdir(target) ;
  }
}
void testCreate(string filename, string dirname){
  // files:
  foreach(fn ; genName(filename))
    try{
      writefln("file to be created : %s", fn) ;
      std.file.write(fn, cast(void[])null) ; 
      writefln("\tsuccess by std.file.write") ; Remove(fn) ;
      (new std.stream.File(fn, FileMode.OutNew)).close() ; 
      writefln("\tsuccess by std.stream") ; Remove(fn) ;
    } catch(Exception e) {
      writefln(e.msg) ;
    }
  // dirs:
  foreach(dn ; genName(dirname))
    try{
      writefln("dir to be created : %s", dn) ;
      std.file.mkdir(dn) ; 
      writefln("\tsuccess by std.file.mkdir") ; Remove(dn) ;
    } catch(Exception e) {
      writefln(e.msg) ;
    }
}
void main(){
  writefln("== test: File & Dir Creation ==") ;
  testCreate("output.txt", "docs") ;
}

DOS Batch File

 md docs
 md \docs

Forth

There is no means to create directories in ANS Forth.

 s" output.txt" w/o create-file throw ( fileid) drop
s" /output.txt" w/o create-file throw ( fileid) drop

Haskell

import System.IO
import System.Directory

createFile name = do
  h <- openFile name WriteMode
  hClose h

main = do
  createFile "output.txt"
  createDirectory "docs"
  createFile "/output.txt"
  createDirectory "/docs"

Java

import java.util.File;
public class CreateFileTest {
   public static String createNewFile(String filename) {
       try {
           // Create file if it does not exist
           boolean success = new File(filename).createNewFile();
           if (success) {
               return " did not exist and was created successfully.";
           } else {
               return " already exists.";
           }
       } catch (IOException e) {
               return " could not be created.";
       }
   }
   public static void test(String type, String filename) {
       System.out.println("The following " + type + " called " + filename + 
           createNewFile(filename)
       );
   }
   public static void main(String args[]) {
        test("file", "output.txt");
        test("file", File.seperator + "output.txt");
        test("directory", "docs");
        test("directory", File.seperator + "docs" + File.seperator);
   }
}

MAXScript

-- Here
f = createFile "output.txt"
close f
makeDir (sysInfo.currentDir + "\docs")
-- System root
f = createFile "\output.txt"
close f
makeDir ("c:\docs")

Perl

use File::Spec::Functions qw(catfile rootdir);
{ # here
    open my $fh, '>', 'output.txt';
    mkdir 'docs';
};
{ # root dir
    open my $fh, '>', catfile rootdir, 'output.txt';
    mkdir catfile rootdir, 'docs';
};

Without Perl Modules

Current directory

perl -e 'qx(touch output.txt)'
perl -e 'mkdir docs'

Root directory

perl -e 'qx(touch /output.txt)'
perl -e 'mkdir "/docs"'

Python

Current directory

import os
f = open("output.txt", "w")
f.close()
os.mkdir("docs")

Root directory

f = open("/output.txt", "w")
f.close()
os.mkdir("/docs")

Works with: Python version 2.5

Exception-safe way to create file:

from __future__ import with_statement
import os
def create(dir):
    with open(os.path.join(dir, "output.txt"), "w"):
        pass
    os.mkdir(os.path.join(dir, "docs"))
   
create(".") # current directory
create("/") # root directory

Tested on Windows. It should work on Linux and possibly on Mac OS X

Raven

"" as str
str 'output.txt'  write
str '/output.txt' write
'docs'  mkdir
'/docs' mkdir

Smalltalk

Squeak has no notion of 'current directory' because it isn't tied to the shell that created it.

 (FileDirectory on: 'c:\') newFileNamed: 'output.txt'; createDirectory: 'docs'.

In GNU Smalltalk you can do instead:

 ws := (File name: 'output.txt') writeStream.
 ws close.
 Directory create: 'docs'.

 ws := (File name: '/output.txt') writeStream.
 ws close.
 Directory create: '/docs'.

Tcl

Assuming that we're supposed to create two files and two directories (one each here and one each in the file system root) and further assuming that the code is supposed to be portable, i.e. work on win, linux, MacOS (the task is really not clear):

close [open output.txt w] 
close [open [file nativename /output.txt] w] 

file mkdir docs
file mkdir [file nativename /docs]

Toka

 needs shell
 " output.txt" "W" file.open file.close
 " /output.txt" "W" file.open file.close

 ( Create the directories with permissions set to 777)
 " docs" &777 mkdir
 " /docs" &777 mkdir

Visual Basic .NET

Platform: .NET

Works with: Visual Basic .NET version 9.0+

'Current Directory
IO.Directory.CreateDirectory("docs")
IO.File.Create("output.txt").Close()

 'Root
IO.Directory.CreateDirectory("\docs")
IO.File.Create("\output.txt").Close()

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

UNIX Shell

 touch output.txt
 touch /output.txt
 mkdir docs
 mkdir /docs