Windows 10: Bug in the DIR command?

Hi all. I'm running Version 10.0.17134.1365 and recently I've been testing long file names and how they're handled in an application that I work on. Strangely I noticed that when I try to see what the short name is for one of these files, they're not displaying correctly.


Here's an example:

Long name: rr6129739dkn79phk2t2hf5pggn3vn1p4x76sj6qw4366j60v14dg93hh6vgr96g64wmhd10bvtvlv7nsdpww5dkl1mw995k3pn0vr10ltv9455qrzl8kwsbprwnwz65dwgld71rxbjj26nn2c3nsv4gwmwc8c3420wcns7vg24x7k3nxrkvl43c84pb8flv78bgl74gqqt7ktf10szcckth7stjzgc9df97n9rgjzqz01234567.txt


Short name SHOULD be: RR3560~1.TXT


What CMD.EXE's DIR command displays:

C:\tmp>dir /X rr6*

01/11/2021 12:27 PM 4 RR3560~1.T rr6129739dkn79phk2t2hf5pggn3vn1p4x76sj6qw4366j60v14dg93hh6vgr96g64wmhd10bvtvlv7nsdpww5dkl1mw995k3pn0vr10ltv9455qrzl8kwsbprwnwz65dwgld71rxbjj26nn2c3nsv4gwmwc8c3420wcns7vg24x7k3nxrkvl43c84pb8flv78bgl74gqqt7ktf10szcckth7stjzgc9df97n9rgjzqz01234567.txt


And the same incorrect short name is displayed if I instead use the /-N option


As an alternative I find I need to use Cygwin to reliably get the short names, so the data DOES exist.

$ find /cygdrive/c/tmp/rr6* xargs -r cygpath -d
C:\tmp\RR3560~1.TXT


And then if I round-trip that short name displayed by Cygwin into the DIR command again, it resolves to the correct long file name:

C:\tmp>dir /B RR3560~1.TXT
rr6129739dkn79phk2t2hf5pggn3vn1p4x76sj6qw4366j60v14dg93hh6vgr96g64wmhd10bvtvlv7nsdpww5dkl1mw995k3pn0vr10ltv9455qrzl8kwsbprwnwz65dwgld71rxbjj26nn2c3nsv4gwmwc8c3420wcns7vg24x7k3nxrkvl43c84pb8flv78bgl74gqqt7ktf10szcckth7stjzgc9df97n9rgjzqz01234567.txt


Does anyone else see this error with DIR on their Win 10 machines?


P.S. If you want to create that long file name just use Save As from Notepad.

:)

 

dir Difficulties

I am getting the hang of this command set.

Maybe somebody know a work around that will list the three time stamps at one time.
Theoretically dir /TC /TA /TW.
dir will only show one of the three at one time.

To me it seems that the only way to get all three on a line is to run loop with output to file, then boiling down the three outputs to one line. Clumsy but maybe the only way to get the job done?

Thanks for any suggestions.

 

Dir command gives unexpected / unwanted results

Or you can try :
dir *.xls | findstr /E ".xls"

as shown here:

How to list only .doc or .xls files with the Windows dir command in the cmd window? - Stack Overflow

(from the above page: Microsoft is treating the string as a regex.)

 

dir Difficulties

DIR uses whatever time definition you tell it to use. Following command would list all files and folders in X:\Downloads in order they have been created:

dir X:\Downloads /t:c

DIR is fully capable to sort files and folders. Following command would list all files in X:\Downloads, oldest first:

dir X:\Downloads /o:d

The minus sign before a parameter reverses the results, so the following command would list the same folder in reversed order, newest first:

dir X:\Downloads /o:-d

You can also combine switches. Following command would list all files and folders in X:\Downloads and all its subfolders (the /s switch), listing them in newest first based on time of file / folder creation:

dir X:\Downloads /s /o:-d /t:c