中国DOS联盟

How to write this file?

Its purpose is to output on the same line without starting a new line.

For example:
echo a >t.txt
Then there is a line in t.txt showing a.

Now the problem is,
echo b >t.txt

b starts a new line in file t.txt. So how to make it display immediately after a, that is:
ba

This article is different from my last post.
The first one is: http://www.cn-dos.net/forum/viewthread.php?tid=25963&fpage=1

I have thought about it for a long time and haven't come up with it. Please help! Thanks

Last edited by scriptor on 2006-12-28 at 02:51 AM ]

set /p =a<nul>a.txt
set /p =b<nul>>a.txt

NaturalJ0 brother
The owner wants to enter a first, then enter b, but b is before a.

Just perform the reaction operation.

set /p =b<nul>a.txt
set /p =a<nul>>a.txt

I don't know if I can read a.txt into a variable. In this way, I can first write a into it, then read it into the variable, then rewrite b. It's okay to write into the variable, but I don't know how, so I can only talk about my own ideas.

Type  不带换行符的文件--假定内容为B    另一个文件--假定内容为A     >demo.txt

::  假定内容为 a 的一个名为 t.txt 的文件文件已经建立。

::  假定要将一个字符　“b”　“插入”　以 t.txt 文件第１个字符的“前”面（左边），则：

@echo off

set /p var=

>t.txt Echo b%var%

Type the file without line breaks -- assume the content is B, another file -- assume the content is A     >demo.txt

(“Continuously” type command reads two files, and sequentially “connects them together” and redirects to write to another file.)
(The file with content without line breaks is created by set/p)

Then the content of demo.txt will be "BA"

Or copy /b .... or For ...

Or “anti -- randomly named” redirect operation...

The content of run.bat is as follows:

:: Assume there is a file t.txt with content a that has been created.

:: Assume to "insert" a character "b" "in front" (left) of the first character of the t.txt file, then:

@echo off

set /p var=

>t.txt Echo b%var%

Alternative use of the above built code method:

C:\TEMP\str\k>type t.txt
a

C:\TEMP\str\k>run.bat<t.txt

C:\TEMP\str\k>type t.txt
ba

Last edited by redtek on 2006-12-28 at 09:55 AM ]

Originally posted by HUNRYBECKY at 2006-12-28 08:42:
Just operate the feedback.

set /p =b<nul>a.txt
set /p =a<nul>>a.txt

Can't input in reverse. My original intention is to first input "a", and then when inputting "b",

make "b" come before "a". If you input "b" first, it won't have my meaning.

It seems this is difficult to achieve??

Is that so?

Is there anyone to answer?

@echo off
:x
set /p b=Input character:
echo %b%>>k.txt
set /p a=<k.txt&echo %b%%a%>k.txt
set /p a=<k.txt&echo %b%%a%>k.txt
goto x
pause>nul

Last edited by PPdos on 2006-12-28 at 11:30 AM ]

copy /y /b con + a.txt b.txt

::输入你要加的内容之后按F6回车即可，然后将b.txt覆盖a.txt。

copy /y b.txt a.txt

::可以达到目的了，可能这不是楼主的本意。

　　A workaround:

　　Suppose the file a.txt already has the "cn-dos" character, and you want to add "www" in front of it. You can operate in the command line like this:

copy /y /b con + a.txt b.txt

::After entering the content you want to add, press F6 and then Enter. Then overwrite a.txt with b.txt.

copy /y b.txt a.txt

::This can achieve the purpose. Maybe this is not what the original poster intended.

= =b Sorry, I misread the LZ's meaning.
echo a>t.txt
set /p tempvariable=<t.txt
echo b%tempvariable%>t.txt

If you have only one line, you can do it like this.

@echo off

if not exist k.txt echo. >k.txt

:x

set /p a=<k.txt

set /p b=输入的字符:

:::echo %b% >>k.txt

echo %b%%a% >k.txt

goto x

There is a bit of error in the code on floor 9.. After inputting 1 2 3 4 5 6 7 8 in sequence, the k.txt file will have 8642 instead of 87654321.

I made some changes.. Tested it and it succeeded!!

The code is as follows:

@echo off

if not exist k.txt echo. >k.txt

:x

set /p a=<k.txt

set /p b=Input character:

:::echo %b% >>k.txt

echo %b%%a% >k.txt

goto x

This reminds me of that batch script that outputs reversed text. ^_^

If it's just to implement such a thing, the following is the implementation with sed:

>t.txt (echo a)
set "var=b"
sed "1i\%var%" t.txt|sed "$!N;s/\n//"|more>t1.txt
type t1.txt