What is the difference between% cd% and% ~ dp0 in DOS batches

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In batch processing of DOS, it is sometimes necessary to know the current path. In DOS, there are two environment variables that can relate to the current path, one is% cd%, and the other is% ~ dp0.

The usage and representation of these two variables are different.

1.% cd% can be used in batch files or on the command line; when expanded, it is the drive letter: + current directory, such as entering the c:\ dir directory in the dos window

Enter: echo% cd%, it will be displayed as: C:\ dir.

The content of% cd% can be changed, which is the execution path of the command or the execution path of the batch file.

2.%~dp0 can only be used in batch files, it is determined by the directory location of the batch file in which it is located, and it is the drive letter: + path where the batch file is located. During the execution of this batch file, its expanded contents cannot be changed. For example, under disk D, there is a batch file, path.bat, which contains:

The code is as follows:

@ echo off

Echo this is cd%% cd%

Echo this is% ~ dp0% ~ dp0

Execute it under C:\ and E:\ respectively, and the output is:

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