for /f "usebackq tokens=1* delims=/" %%a in (`dir /b "C:\pdf\"`)
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中国DOS联盟论坛 » DOS批处理 & 脚本技术（批处理室） » What does this batch processing mean? for /f "usebackq tokens=1*
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Original Poster
Posted 2008-08-10 11:39 · 中国 山东 淄博 桓台县 联通
Floor 2
Posted 2008-08-10 11:42 · 中国 广东 东莞 电信
Extract all columns of the entire row, ignoring spaces
Floor 3
Posted 2008-08-10 13:07 · 中国 广东 汕头 电信
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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
Example 2
[ Last edited by haiou327 on 2008-8-10 at 01:59 PM ]
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 ]
Floor 4
Posted 2008-08-10 13:09 · 中国 广东 汕头 电信
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```
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 ]
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 ]
Floor 5
Posted 2010-03-18 16:09 · 中国 广东 佛山 顺德区 电信
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
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