Resolve absolute path from relative path and/or file name

 

Is there a way in a Windows batch script to return an absolute path from a value containing a filename and/or relative path?

Given: 

".."
"..somefile.txt"

I need the absolute path relative to the batch file.

Example:

  • "somefile.txt" is located in "C:Foo"
  • "test.bat" is located in "C:FooBar".
  • User opens a command window in "C:Foo" and calls Bartest.bat ..somefile.txt
  • In the batch file "C:Foosomefile.txt" would be derived from %1

    • In batch files, as in standard C programs, argument 0 contains the path to the currently executing script. You can use %~dp0 to get only the path portion of the 0th argument (which is the current script) - this path is always a fully qualified path.

    You can also get the fully qualified path of your first argument by using %~f1 , but this gives a path according to the current working directory, which is obviously not what you want.

    Personally, I often use the %~dp0%~1 idiom in my batch file, which interpret the first argument relative to the path of the executing batch. It does have a shortcoming though: it miserably fails if the first argument is fully-qualified.

    If you need to support both relative and absolute paths, you can make use of Frédéric Ménez's solution: temporarily change the current working directory.

    Here's an example that'll demonstrate each of these techniques: 

    @echo off
echo %%~dp0 is "%~dp0"
echo %%0 is "%0"
echo %%~dpnx0 is "%~dpnx0"
echo %%~f1 is "%~f1"
echo %%~dp0%%~1 is "%~dp0%~1"

rem Temporarily change the current working directory, to retrieve a full path 
rem   to the first parameter
pushd .
cd %~dp0
echo batch-relative %%~f1 is "%~f1"
popd

    If you save this as c:tempexample.bat and the run it from c:UsersPublic as

    c:UsersPublic>tempexample.bat ..windows

    ...you'll observe the following output: 

    %~dp0 is "C:temp"
%0 is "tempexample.bat"
%~dpnx0 is "C:tempexample.bat"
%~f1 is "C:Userswindows"
%~dp0%~1 is "C:temp..windows"
batch-relative %~f1 is "C:Windows"

    I came across a similar need this morning: how to convert a relative path into an absolute path inside a Windows command script.

    The following did the trick: 

    @echo off

set REL_PATH=....
set ABS_PATH=

rem // Save current directory and change to target directory
pushd %REL_PATH%

rem // Save value of CD variable (current directory)
set ABS_PATH=%CD%

rem // Restore original directory
popd

echo Relative path: %REL_PATH%
echo Maps to path: %ABS_PATH%

    Most of these answers seem crazy over complicated and super buggy, here's mine -- it works on any environment variable, no %CD% or PUSHD / POPD , or for /f nonsense -- just plain old batch functions. -- The directory & file don't even have to exist. 

    CALL :NORMALIZEPATH "......foobar.txt"
SET BLAH=%RETVAL%

ECHO "%BLAH%"

:: ========== FUNCTIONS ==========
EXIT /B

:NORMALIZEPATH
  SET RETVAL=%~dpfn1
  EXIT /B
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