%cd% is available either to a batch file or at the command prompt and expands to the drive letter and path of the current directory (which can change e.g. by using the CD command)
%~dp0 is only available within a batch file and expands to the drive letter and path in which that batch file is located (which cannot change). It is obtained from %0 which is the batch file's name.
An experiment like the following shows the difference
Here is D:\dirshow.bat:
Code:
@echo off
echo this is %%cd%% %cd%
echo this is %%~dp0 %~dp0
Run it from C:\ and this is what you see
Code:
C:\>D:\dirshow.bat
this is %cd% C:\
this is %~dp0 D:\
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MS-DOS 批处理技术
本文转自海天一鸥博客园博客，原文链接：http://www.cnblogs.com/sgsoft/archive/2010/09/12/1824275.html，如需转载请自行联系原作者
