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Sometimes we see others using %~dp0

~ is the meaning of extension, equivalent to converting a relative path into an absolute path

%0 refers to the batch file itself

%1 indicates the first parameter received on the batch file command line,%2 indicates the second, and so on

%~d0 refers to the drive letter where the batch is located, where d represents drive

%~p0 refers to the directory where the batch is located, where p represents path

%~dp0 is the letter and path where the batch is located

cd %~dp0 is to enter the directory where the batch processing is located

For further explanation, please refer to the command call /?

What does %~dp0 mean in DOS batch processing?

(Note: %0 is the file name of the batch file)

And that means

Change the current directory to the directory of the batch itself

A little dizzy? Take your time. Let me give you an example.

For example, if you have a batch a.bat in the E:/jb51 folder

a.bat content is

cd /d %~dp0

here

cd /d %~dp0 means cd /d e:/jb51

%0 represents the batch itself e:/jb51/a.bat

~dp is a variable extension

d is extended to partition number e:

p is extended to path/jb51

dp is extended to partition number path e:/jb51

Below is a picture.

Extended variable syntax details:

:: Option syntax:

:: ~I -Remove any quotes ("), extend %I

:: %~fI -expands %I to a fully qualified pathname

:: %~dI -Extend %I to a single drive letter only

:: %~pI -only extend %I to a path

:: %~nI -only extend %I to a filename

:: %~xI -only extend %I to a file extension

:: %~sI -Extended path contains only short names

:: %~aI -extends %I to file attributes of file

:: %~tI -Date/time %I was extended to file

:: %~zI -Extend %I to file size

:: %~$PATH:I -Find directories listed in path environment variable and extend %I

:: To find the first fully qualified name. If the environment variable name

:: undefined, or file not found, this key combination expands to

:: Empty string

:: Modifiers can be combined to get multiple results:

:: %~dpI -extend %I to only one drive letter and path

:: %~nxI -only extend %I to a file name and extension

:: %~fsI -only expand %I to a full pathname with a short name

:: %~dp$PATH:i -Find directories listed in path environment variable and extend %I

:: To the first drive letter and path found.

:: %~ftzaI -extends %I to DIR like output lines

Here is an example:

If an install.bat file is located at D:\jeesite\bin

The document reads as follows:

@echo offecho [INFO] This is a demo.echo [INFO] %~dp0pause

Run install.bat and the command line output looks like this

[INFO] This is a demo. [INFO] D:\jeesite\bin\

Namely:

%0 represents the file itself

d stands for drive letter

P stands for path.

Extended options also include:

%~f0 -full path + filename

[INFO] D:\jeesite\bin\install.bat

%~n0 -filename (no extension)

[INFO] install

%~x0 -file extension

[INFO] .bat

%~s0 -Extended path contains only short names ("s" is Short, short)

%~a0 -extends %0 to file attributes of file ("a" is attribute)

%~t0 -Date/time %0 was extended to file ("t"time)

%~z0 -Expand %0 to file size (Size)

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