Dir (command)

For other uses, see Dir (disambiguation).

In computing, dir (directory) is a command in various computer operating systems used for computer file and directory listing.^[1] It is one of the basic commands to help navigate the file system. The command is usually implemented as an internal command in the command-line interpreter (shell). On some systems, a more graphical representation of the directory structure can be displayed using the tree command.

kerala computer

The SpartaDOS X DIR command
Developer(s)	DEC, DR, Intel, Cromemco, MetaComCo, Microsoft, IBM, Datalight, ICD, Inc.
Operating system	CP/M, MP/M, ISIS-II, iRMX 86, CDOS, TRIPOS, DOS, MSX-DOS, SISNE plus, 4690 OS, PC-MOS, OS/2, Windows, Singularity, ReactOS, AROS, VMS, RT-11, RSX-11, OS/8, AmigaDOS
Platform	Cross-platform
Type	Command
License	CP/M, MP/M: BSD-like MS-DOS: MIT PC-MOS: GPL-3.0-only ReactOS: GPL

Implementations

Screenshot showing the "Abort, Retry, Fail?" prompt on MS-DOS.

The command is available in the command-line interface (CLI) of the operating systems Digital Research CP/M,^[2] MP/M,^[3] Intel ISIS-II,^[4] iRMX 86,^[5] Cromemco CDOS,^[6] MetaComCo TRIPOS,^[7] DOS, IBM/Toshiba 4690 OS,^[8] IBM OS/2,^[9] Microsoft Windows,^[10] Singularity, Datalight ROM-DOS,^[11] ReactOS,^[12] GNU,^[13] AROS^[14] and in the DCL command-line interface used on DEC VMS, RT-11 and RSX-11. It is also supplied with OS/8 as a CUSP (Commonly-Used System Program).

The dir command is supported by Tim Paterson's SCP 86-DOS.^[15] On MS-DOS, the command is available in versions 1 and later.^[16] It is also available in the open source MS-DOS emulator DOSBox. MS-DOS prompts "Abort, Retry, Fail?" after being commanded to list a directory with no diskette in the drive.

The numerical computing environments MATLAB and GNU Octave include a dir function with similar functionality.^[17][18]

Examples

CP/M 3.0 directory listing on a Commodore 128 home computer.

Directory listing on SCP running on a robotron PC 1715.

Directory listing on CP/J 2.21 running on an Elwro 804 Junior.

Microsoft Windows Command Prompt showing a directory listing.

DOS, Windows, ReactOS

List all files and directories in the current working directory.

C:\Users>dir

List any text files and batch files (filename extension ".txt" or ".bat").

C:\Users>dir *.txt *.bat

Recursively list all files and directories in the specified directory and any subdirectories, in wide format, pausing after each screen of output. The directory name is enclosed in double-quotes, to prevent it from being interpreted is as two separate command-line options because it contains a whitespace character.

C:\Users>dir /s /w /p "C:\Users\johndoe\My Documents"

List any NTFS junction points:

<syntaxhighlight lang="doscon" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">C:\Users>dir /ash</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">Volume in drive C is OS.</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">Volume Serial Number is xxxx-xxxx</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">Directory of C:\Users</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">12/07/2019  02:30 AM    <SYMLINKD>     All Users [C:\ProgramData]</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">12/07/2019  02:30 AM    <JUNCTION>     Default User [C:\Users\Default]</syntaxhighlight>
<syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">12/07/2019  02:12 AM               174 desktop.ini</syntaxhighlight>
              <syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">1 File(s)            174 bytes</syntaxhighlight>
              <syntaxhighlight lang="output" class="" style="background:none; border:none; color:inherit; padding: 0px 0px;" inline="1">2 Dir(s)  332,659,789,824 bytes free</syntaxhighlight>

Unices

dir is not a Unix command; Unix has the analogous ls command instead. The GNU operating system, however, has a dir command that "is equivalent to ls -C -b; that is, by default files are listed in columns, sorted vertically, and special characters are represented by backslash escape sequences".^[19] Actually, for compatibility reasons, ls produces device-dependent output. The dir instruction, unlike ls -Cb, produces device-independent output.

See also

• Directory (OpenVMS command)
• List of DOS commands
• ls (corresponding command for *nix systems)

References

1. Rügheimer, Hannes; Spanik, Christian (October 22, 1988). AmigaDOS quick reference. Grand Rapids, Mi : Abacus. ISBN 9781557550491 – via Internet Archive.
2. "Operating manual" (PDF). cpm.z80.de. Retrieved 2019-10-22.
3. Digital Research (1981-09-25). MP/M-86 Operating System - User's Guide (PDF) (1 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
4. ISIS II Users Guide
5. iRMX 86 INTRODUCTION AND OPERATOR'S REFERENCE MANUAL For Release 6
6. CDOS USER'S MANUAL
7. "Introduction to Tripos" (PDF). Retrieved 2019-10-22.
8. ^{[dead link]}
9. "JaTomes Help - OS/2 Commands". www.jatomes.com. Archived from the original on 2019-04-14. Retrieved 2019-07-20.
10. "MS-DOS and Windows command line dir command". www.computerhope.com.
11. "Datalight ROM-DOS User's Guide" (PDF). www.datalight.com.
12. "GitHub - reactos/reactos: A free Windows-compatible Operating System". October 22, 2019 – via GitHub.
13. "GNU Coreutils Manual". Free Software Foundation.
14. "AROS Research Operating System". aros.sourceforge.net.
15. 86-DOS - Disk Operating System for the 8086 - User's Manual (PDF). Version 0.3 (Preliminary ed.). Seattle, Washington, USA: Seattle Computer Products, Inc. 1980. Archived from the original (PDF) on 2019-07-14. Retrieved 2019-07-14. (59 pages)
16. Wolverton, Van (2003). Running MS-DOS Version 6.22 (20th Anniversary Edition), 6th Revised edition. Microsoft Press. ISBN 0-7356-1812-7.
17. "List folder contents - MATLAB dir". www.mathworks.com.
18. "Function Reference: dir". octave.sourceforge.io.
19. dir invocation (GNU coreutils) at www.gnu.org

Further reading

• Wolverton, Van (1990). MS-DOS Commands: Microsoft Quick Reference, 4th Revised edition. Microsoft Press. ISBN 978-1556152894.
• Kathy Ivens; Brian Proffit (1993). OS/2 Inside & Out. Osborne McGraw-Hill. ISBN 978-0078818714.
• Frisch, Æleen (2001). Windows 2000 Commands Pocket Reference. O'Reilly. ISBN 978-0-596-00148-3.

External links

• dir | Microsoft Docs
• Open source DIR implementation that comes with MS-DOS v2.0
• Dir command syntax and examples