China DOS Union

Suppose: I want to list the complete paths of all text files named test.txt under drive E. I used the following code:

@echo off

for /f "delims=" %%i in ('dir /a-d /b /s e:\test.txt') do echo "%%~dpi"

pause

If there happens to be a folder named test.txt under the root directory of drive E, then there will be a ruckus: the path E:\test.txt will be displayed as many times as there are files under E:\test.txt! If there are no files under E:\test.txt, the path E:\test.txt will not be displayed at all. If the folder test.txt exists in a subfolder of drive E, such a situation will not occur.

A little analysis reveals that the reason is this: the name test.txt is ambiguous: it can represent both a text file named test and a folder named test.txt; and the dir command for searching for a specified file in the entire partition must be written in the format dir /a-d /s e:\test.txt. In this way, because of the ambiguity of test.txt, dir will search for all types of files under the folder e:\test.txt and also search for all text files named test under drive E.

The solution is: check the result after dir. The code can be modified as:

@echo off

for /f "delims=" %%i in ('dir /a-d /b /s e:\test.txt') do (

    if /i "%%~nxi"=="test.txt"  echo "%%~dpi"

)

pause

[ Last edited by namejm on 2007-3-8 at 03:52 PM ]

Hehe,Ifollowthetrainofthoughtoftheownertowriteasectionofcodebar,thiscodetrainofthoughtistofirstextractalltxt,thencheckthefilename,andthejmcodeistofirstextractalltest.txtandE:\test.txtallfiles(includingsubdirectoriesinthedirectory),thencheckthefilename

@echo off

for /f "delims=" %%i in ('dir /a-d /b /s e:\*.txt') do (

    if /i "%%~ni"=="test" do echo "%%~dpi"

)

pause

If the number of txt files is huge, the jm code will be a bit faster

If there are several test.txt files,
How to find the one of a certain date?

Got it, I've learned something. As a newbie, I got some inspiration from this. The moderator is really awesome!

The following is the translation:

if /i "%%~nxi"=="test.txt" I don't understand what this sentence means. As a result, I removed this sentence and it can also work. Hehe
@echo off
for /f "delims=" %%i in ('dir /a-d /b /s 'dir /a-d /b /s e:\test.txt') do (
echo "%%~dpi"
)

Originally posted by shuaigeya at 2007-3-9 18:46:
I don't understand the meaning of the sentence "if /i "%%~nxi"=="test.txt"". As a result, I removed this sentence and it still works. Hehe
@echo off
for /f "delims=" %%i in ('dir /a-d /b /s 'd ...

for /?



In addition, the replacement of FOR variable references has been enhanced. You can now use the following
option syntax:

~I - Remove any quotation marks ("), expand %I
%~fI - Expand %I to a fully qualified pathname
%~dI - Expand %I to only a drive letter
%~pI - Expand %I to only a path
%~nI - Expand %I to only a file name
%~xI - Expand %I to only a file extension
%~sI - The expanded path only contains the short name
%~aI - Expand %I to the file attributes of the file
%~tI - Expand %I to the date/time of the file
%~zI - Expand %I to the size of the file
%~$PATH:I - Find the directory listed in the path environment variable, and expand %I
to the first fully qualified name found. If the environment variable name
is not defined, or the file is not found, this combination key will expand to
empty string

Multiple results can be obtained by combining modifiers:

%~dpI - Expand %I to only a drive letter and path
%~nxI - Expand %I to only a file name and extension
%~fsI - Expand %I to a complete pathname with a short name only
%~dp$PATH:i - Find the directory listed in the path environment variable, and expand %I
to the first drive letter and path found.
%~ftzaI - Expand %I to a DIR-like output line

So it is!

if /i "%%~nxi"=="test.txt" echo "%%~dpnxi"

Used cleverly, used well!

@echo off
for /f "delims=" %%i in ('dir /a-d /b /s e:\test.txt') do (
if /i "%%~nxi"=="test.txt" echo "%%~dpnxi"
)
pause

Got it, it's a bit clear now. The explanation given by xycoordinate on the 6th floor is really good, saving me from looking it up myself.......

Actually, this is also okay.

@echo off
for /r e:\ %%i in (*.txt) do (
if /i "%%~nxi"=="test.txt" echo "%%~dpi"
)
pause

I'm dizzy. You are all experts. I'm new here. I hope for your care.... Even the DIR command I have a lot of don't understand. Depressed

Upvoted. All are experts. Amazing!