China DOS Union

To generate a file a.txt with the content "123456" using the for /l command, you can modify the command as follows:

```batch
@echo off
setlocal enabledelayedexpansion
set "str="
for /l %%d in (1,1,6) do (
set "str=!str!%%d"
)
echo !str!>a.txt
endlocal
```

This code first initializes an empty string, then appends each number from 1 to 6 to the string within the loop. Finally, it echoes the concatenated string to the file a.txt, thus avoiding the line breaks.

setlocal enabledelayedexpansion
set str=

for /l %%d in (1,1,6) do set str=!str!%%d
echo !str!
pause

```
for /l %a in (1,1,6) do @<nul,set/p=%a
```

95 is quite not bad, o(∩_∩)o... Haha