Delete a file: Difference between revisions
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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. |
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. |
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=={{header|Ada}}== |
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<ada> |
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with Ada.Directories; use Ada.Directories; |
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</ada> |
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and then |
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<ada> |
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Delete_File ("input.txt"); |
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Delete_File ("/input.txt"); |
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Delete_Tree ("docs"); |
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Delete_Tree ("/docs"); |
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</ada> |
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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]]. |
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=={{header|ALGOL 68}}== |
=={{header|ALGOL 68}}== |
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Note: <code>scratch</code> does not appear to do anything on [[ALGOL 68G]]. Also note that file names are Operating System dependent. |
Note: <code>scratch</code> does not appear to do anything on [[ALGOL 68G]]. Also note that file names are Operating System dependent. |
Revision as of 18:31, 3 December 2008
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
<ada> with Ada.Directories; use Ada.Directories; </ada> and then <ada> Delete_File ("input.txt"); Delete_File ("/input.txt"); Delete_Tree ("docs"); Delete_Tree ("/docs"); </ada> 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") )
C
ISO C: <c>#include <stdio.h>
int main() {
remove("input.txt"); remove("/input.txt"); remove("docs"); remove("/docs"); return 0;
}</c>
POSIX: <c>#include <unistd.h>
int main() {
unlink("input.txt"); unlink("/input.txt"); rmdir("docs"); rmdir("/docs"); return 0;
}</c>
D
<d>import tango.io.Path;
void main() {
remove("input.txt"); remove("/input.txt"); remove("docs"); remove("/docs");
}</d>
POSIX: <d>import tango.stdc.posix.unistd;
void main() {
unlink("input.txt"); unlink("/input.txt"); rmdir("docs"); rmdir("/docs");
}</d>
Forth
There is no means to delete directories in ANS Forth.
s" input.txt" delete-file throw s" /input.txt" delete-file throw
Fortran
I don't know a way of deleting directories in 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")
Haskell
import System.IO import System.Directory main = do removeFile "output.txt" removeDirectory "docs" removeFile "/output.txt" removeDirectory "/docs"
Io
Directory fileNamed("input.txt") remove Directory directoryNamed("docs") remove RootDir := Directory clone setPath("/") RootDir fileNamed("input.txt") remove RootDir directoryNamed("docs") remove
Java
<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); }
}</java>
MAXScript
There's no way to delete folders in MAXScript
-- Here deleteFile "input.txt" -- Root deleteFile "\input.txt"
OCaml
<ocaml>Sys.remove "input.txt";; Sys.remove "/input.txt";;</ocaml>
with the Unix library: <ocaml>#load "unix.cma";; Unix.unlink "input.txt";; Unix.unlink "/input.txt";; Unix.rmdir "docs";; Unix.rmdir "/docs";;</ocaml>
Perl
<perl>use File::Spec::Functions qw(catfile rootdir);
- here
unlink 'input.txt'; rmdir 'docs';
- root dir
unlink catfile rootdir, 'input.txt'; rmdir catfile rootdir, 'docs';</perl>
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"'
PowerShell
Delete-Item input.txt
# Can also use the del alias for the Delete-Item cmdlet del input.txt
Python
<python>import os
- current directory
os.remove("output.txt") os.rmdir("docs")
- root directory
os.remove("/output.txt") os.rmdir("/docs")</python>
Raven
'input.txt' delete '/input.txt' delete 'docs' rmdir '/docs' rmdir
Ruby
#!/usr/bin/env ruby File.delete("output.txt", "/output.txt") Dir.delete("docs") Dir.delete("/docs")
Toka
needs shell " docs" remove " input.txt" remove
UNIX Shell
rm -rf docs rm input.txt rm -rf /docs rm /input.txt
Visual Basic .NET
Platform: .NET
'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")