China DOS Union

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 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 ]

= =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.

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