What does d0 mean in a Windows batch file

Question

I m looking at a batch file which defines the following variables   set  SCRIPT DRIVE   d0 set  SCRIPT PATH   p0    What do   d0 or   p0 actually mean  Is there a set of well-known values for things like current directory  drive  parameters to a script  Are there any other similar shortcuts I could use

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It displays the current location of the file or directory that you are currently in  for example  if your batch file was in the desktop directory  then    dp0  would display the desktop directory  if you wanted it to display the current directory with the current file name you could type    dp0  n0  x0

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Another tip that would help a lot is that to set the current directory to a different drive one would have to use   d0 first  then cd   dp0  This will change the directory to the batch file s drive  then change to its folder   For  oneLinerLovers  cd  d   dp0 will change both the drive and directory     Hope this helps someone

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The magic variables  n contains the arguments used to invoke the file   0 is the path to the bat-file itself   1 is the first argument after   2 is the second and so on   Since the arguments are often file paths  there is some additional syntax to extract parts of the path   d is drive   p is the path  without drive    n is the file name  They can be combined so  dp is drive path     dp0 is therefore pretty useful in a bat  it is the folder in which the executing bat file resides   You can also get other kinds of meta info about the file   t is the timestamp   z is the size    Look here for a reference for all command line commands  The tilde-magic codes are described under for

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Yes  There are other shortcuts that you can use which are given below   In your command   d0 would mean the drive letter of the 0th argument      expands the given variable d gets the drive letter only 0 is the argument you are referencing   As the 0th argument is the script path  it gets the drive letter of the path for you  You can use the following shortcuts too     1         - expands  1 removing any surrounding quotes       f1        - expands  1 to a fully qualified path name   d1        - expands  1 to a drive letter only   p1        - expands  1 to a path only   n1        - expands  1 to a file name only   x1        - expands  1 to a file extension only   s1        - expanded path contains short names only   a1        - expands  1 to file attributes   t1        - expands  1 to date time of file   z1        - expands  1 to size of file    PATH 1   - searches the directories listed in the PATH                environment variable and expands  1 to the fully                qualified name of the first one found   If the                environment variable name is not defined or the                file is not found by the search  then this                modifier expands to the empty string        dp1       - expands  1 to a drive letter and path only   nx1       - expands  1 to a file name and extension only   dp PATH 1 - searches the directories listed in the PATH                environment variable for  1 and expands to the                drive letter and path of the first one found    ftza1     - expands  1 to a DIR like output line   This can be also found directly in command prompt when you run CALL    or FOR

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This code explains the use of the  tilda character  which was the most confusing thing to me   Once I understood this  it makes things much easier to understand    ECHO off SET  PATH   dp0  PATH   ECHO  PATH  ECHO  CALL  testargs  these are days   when the brave endure  GOTO  pauseit  testargs SET ARGS   1   2  1  2 ECHO  ARGS  ECHO  exit  B 0  pauseit pause

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They are enhanced variable substitutions  They modify the  N variables used in batch files  Quite useful if you re into batch programming in Windows     I         - expands  I removing any surrounding quotes        fI        - expands  I to a fully qualified path name   dI        - expands  I to a drive letter only   pI        - expands  I to a path only   nI        - expands  I to a file name only   xI        - expands  I to a file extension only   sI        - expanded path contains short names only   aI        - expands  I to file attributes of file   tI        - expands  I to date time of file   zI        - expands  I to size of file    PATH I   - searches the directories listed in the PATH                environment variable and expands  I to the                fully qualified name of the first one found                 If the environment variable name is not                defined or the file is not found by the                search  then this modifier expands to the                empty string   You can find the above by running FOR

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Some gotchas to watch out for   If you double-click the batch file  0 will be surrounded by quotes  For example  if you save this file as c  test bat    echo  0  pause   Double-clicking it will open a new command prompt with output    C  test bat    But if you first open a command prompt and call it directly from that command prompt   0 will refer to whatever you ve typed  If you type test batEnter  the output of  0 will have no quotes because you typed no quotes   c   gt test bat test bat   If you type testEnter  the output of  0 will have no extension too  because you typed no extension   c   gt test test   Same for  tEsTEnter   c   gt tEsT tEsT   If you type  test Enter  the output of  0 will have quotes  since you typed them  but no extension   c   gt  test   test    Lastly  if you type  C  test bat   the output would be exactly as though you ve double clicked it   c   gt  C  test bat   C  test bat    Note that these are not all the possible values  0 can be because you can call the script from other folders   c  some folder gt     teST bAt     teST bAt   All the examples shown  above  will also affect   0  because the output of   0 is simply the output of  0  minus quotes   if any

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From Filename parsing in batch file and more idioms - Real s How-to   The path  without drive  where the script is    p0  The drive where the script is    d0

User · Answer

d0 gives you the drive letter of argument 0  the script name     p0 the path

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