China DOS Union

After booting with a WIN 98 boot disk, under DOS, I want to turn these two commands, “sys e:” and “copy abc.exe e:”, into a single command, so that running it once is equivalent to finishing the above two steps. Of course this can be done with a batch file, but the hard part is that the E drive in the two commands above is not fixed; it could be sys e:, or it could be sys f: or sys g:
I’ve seen some experts make a *.com file so that *.com X (x is any drive letter) can do it
How should this be made?

I don't understand what you mean!

Try this:
Create a my.bat file, and put this in it:

@echo off
if "%1"="" goto end
if "%2"="" goto end
:start
set drv=%1
set copyfile=%2
sys %drv%:
copy %copyfile% %drv%:
:end
if not "%drv%"="" set drv=
if not "%copyfile%"="" set copyfile=

After that, run it like this:
my.bat e: abc.exe
Here, “e:” is your drive letter, and “abc.exe” is the filename you want to copy.