China DOS Union

Here is a batch file. I don't understand it. I don't understand SHIFT or the parameters.
REM MYCOPY.BAT copies any number of
REM files to a directory. The command
REM is MYCOPY DIR FILES

SET TODIR=%1
:ONE
SHIFT
IF"%1"=" "GOTO TWO
COPY %1 %TODIR%
GOTO ONE
:TWO
SET TODIR=
ECHO ALL DONE

Thanks in advance

I'm just thinking of learning this. Friend in the post above, could you send me a SHIFT program? I'm trying to study it, thanks.
lks205#163.com　(please change ＃ to ＠)

Replied already, thanks

The function of Shift is to move the command-line parameters forward, that is, %2 becomes %3, %2 becomes %1, and so on.

SHIFT


　　Changes the position of replaceable parameters in a batch program.

　　

　　Syntax

　　
　　SHIFT

　　SHIFT─Notes

　　How the SHIFT command works

　　The SHIFT command changes the values of replaceable parameters %0 to %9 by copying each parameter to the previous parameter. That is, the value of %1 is copied to %0, the value of %2 is copied to %1, and so on. This command is useful for batch files that perform the same operation on a series of parameters.

　　

　　:m567

　　Using more than 10 command-line parameters

　　

　　Using the SHIFT command, a batch file can also receive more than 10 command-line parameters. If the specified command-line parameters exceed 10, then the parameters appearing after the 10th parameter (%9) will in turn be shifted into (%9).

　　

　　Restoring replaceable parameters

　　The SHIFT command is irreversible. Once the SHIFT command has been executed, the first parameter before the SHIFT command (%0) cannot be restored.

　　

　　

　　SHIFT─Example

　　The following batch file MYCOPY.BAT shows how to use the SHIFT command to process any number of command-line parameters and copy a series of files to a specified directory. The parameters used are the directory name followed by a series of file names.

　　

　　@echo off

　　rem MYCOPY.BAT copies any number of files

　　rem to a directory。

　　rem The command uses the following syntax:

　　rem mycopy dir file1 file2 ...

　　set todir=%1

　　:getfile

　　shift

　　if "%1"=="" goto end

　　copy %1 %todir%

　　goto getfile

　　:end

　　set todir=

　　echo All done