What does this batch processing mean? for /f "usebackq tokens=1* - China DOS Union Forum

In the content output by set, use / as the delimiter, divide into two columns. Take the part to the left of the first / number as a segment to assign to %%a, and take the entire part starting from the right of the first / number as a segment to assign to %%b.

For example, the content of DIR is
c:\pdf\1.txt
c:\pdf\2.txt
c:\pdf\3.rar
c:\pdf\4.bmp

Then use \ as the delimiter,
c:
c:
c:
c:
The first column is assigned to %%a

pdf\1.txt
pdf\2.txt
pdf\3.rar
pdf\4.bmp
All are assigned to %%b

But the parameter you used here is DIR/B, which only outputs the file name, so tolens=1* delims=\ is redundant. Your sentence is standard.
Just change it to the following: for /f "delims=*" %%a in ('dir /b d:\qq\') do (
echo %%a

Combine with your above two examples and you can take a look
The following is example 1

@echo off
md d:\pdf 2>nul
type>d:\name.txt 2>nul
type>>d:\pdf\1.txt 2>nul
type>>d:\pdf\2.txt 2>nul
type>>d:\pdf\3.rar 2>nul
type>>d:\pdf\4.bmp 2>nul
for /r d:\pdf\ %%i in (*) do (
echo %%~i >>d:\name.txt
         )
for /f "tokens=1* delims=\" %%a in (d:\name.txt) do (
echo %%a
)
pause

Example 2


@echo off
md d:\pdf 2>nul
type>d:\name.txt 2>nul
type>>d:\pdf\1.txt 2>nul
type>>d:\pdf\2.txt 2>nul
type>>d:\pdf\3.rar 2>nul
type>>d:\pdf\4.bmp 2>nul
for /r d:\pdf\ %%i in (*) do (
echo %%~i >>d:\name.txt
         )
for /f "tokens=1* delims=\" %%a in (d:\name.txt) do (
echo %%b
)
pause

[ Last edited by haiou327 on 2008-8-10 at 01:59 PM ]

Floor1　linuxzhen	Posted 2008-08-10 11:39
新手上路　Posts 2　Credits 8
for /f "usebackq tokens=1* delims=/" %%a in (`dir /b "C:\pdf\"`) Emergency help

Floor2　dosyenanjs	Posted 2008-08-10 11:42
初级用户　Posts 11　Credits 22
Extract all columns of the entire row, ignoring spaces

Floor3　haiou327	Posted 2008-08-10 13:07
高级用户　Posts 348　Credits 713
In the content output by set, use / as the delimiter, divide into two columns. Take the part to the left of the first / number as a segment to assign to %%a, and take the entire part starting from the right of the first / number as a segment to assign to %%b. For example, the content of DIR is c:\pdf\1.txt c:\pdf\2.txt c:\pdf\3.rar c:\pdf\4.bmp Then use \ as the delimiter, c: c: c: c: The first column is assigned to %%a pdf\1.txt pdf\2.txt pdf\3.rar pdf\4.bmp All are assigned to %%b But the parameter you used here is DIR/B, which only outputs the file name, so tolens=1* delims=\ is redundant. Your sentence is standard. Just change it to the following: for /f "delims=" %%a in ('dir /b d:\qq\') do ( echo %%a Combine with your above two examples and you can take a look The following is example 1 @echo off md d:\pdf 2>nul type>d:\name.txt 2>nul type>>d:\pdf\1.txt 2>nul type>>d:\pdf\2.txt 2>nul type>>d:\pdf\3.rar 2>nul type>>d:\pdf\4.bmp 2>nul for /r d:\pdf\ %%i in () do ( echo %%~i >>d:\name.txt ) for /f "tokens=1* delims=\" %%a in (d:\name.txt) do ( echo %%a ) pause Example 2 @echo off md d:\pdf 2>nul type>d:\name.txt 2>nul type>>d:\pdf\1.txt 2>nul type>>d:\pdf\2.txt 2>nul type>>d:\pdf\3.rar 2>nul type>>d:\pdf\4.bmp 2>nul for /r d:\pdf\ %%i in () do ( echo %%~i >>d:\name.txt ) for /f "tokens=1 delims=\" %%a in (d:\name.txt) do ( echo %%b ) pause [ Last edited by haiou327 on 2008-8-10 at 01:59 PM ]

Floor4　haiou327	Posted 2008-08-10 13:09
高级用户　Posts 348　Credits 713
``` for /f "usebackq tokens=1* delims=/" %%a in (`dir /b "C:\pdf\"`) do ( echo %%a ) ``` is equivalent to ``` for /f "tokens=1* delims=/" %%a in ('dir /b C:\pdf\') do ( echo %%a ) ``` If the path has no spaces, the tokens parameter can be omitted [ Last edited by haiou327 on 2008-8-10 at 01:57 PM ]

Floor5　zaixinxiangnian	Posted 2010-03-18 16:09
初级用户　Posts 106　Credits 151　From 河南省
Still the enthusiasm here of ours,,, we are beginners and can't understand those two examples of yours. Can you explain them sentence by sentence? Thank you so much