IF EXIST - Batch script to match case - batch-file

Question

My requirement is to check if the file exists in a folder only when case matches the search.
I have searched the internet, also the basic command prompt help guide. I have no accurate answer. However, in the StackOverflow post: REF-Post the solution is provided by sending FileName as a variable to batch file. However, I would like to search the file by not using any variable sent to the Batch file.
#echo off
dir /b /a-d "%~1"|find "%~1" >nul
if %errorlevel% == 0 (echo found) else (echo fail)
This code takes %~1 value and I want to substitute %~1 with a path directly! Please help with the solution
For example:
a file named testfile.txt exists in folder C:\Files\
Logic should be something like below:
IF EXIST C:\Files\TESTFILE.txt (
echo file of case exists
) else (
echo file of this case does not exist
)

Answer 1

Here is a corrected form of Gerhard's original answer using FINDSTR:
dir "C:\files" /b /a-d | findstr /x /c:"TESTFILE.txt" && echo Found || echo Not found
The /c:"string" option is needed to force a literal interpretation (not regex), and to allow spaces in the name. The /X option is needed to force an exact match. You don't want to mistakenly match "the_TESTFILE.txt".
The above is probably the most straight-forward technique.
This can also be solved with a FOR statement. If %%F contains the name of an existing file (case insensitive), then %%~nxF will expand to the actual case sensitive name on disk.
But if %%F does not exists, then %%~nxF will never change the case. So IF EXIST must also be used.
The command must be carefully constructed to give the correct result. My goal is to have a self contained construct that allows use of && and || at the end to conditionally take action depending on whether the file exists or not.
pushd C:\files
(
for %%F in ("TESTFILE.txt") do (
if exist %%F if %%~F==%%~nxF popd & (call)
) && popd
) && echo NOT FOUND || echo FOUND
or on a single line
pushd C:\files&(for %%F in ("TESTFILE.txt") do (if exist %%F if %%~F==%%~nxF popd&(call))&&popd) && echo NOT FOUND || echo FOUND
Note the inverse logic. If the file exists with matching case, then (call) is the last executed command within the parentheses, resulting in a non-zero return code. If the file does not exists or does not match case, then popd is the last executed command within parentheses, resulting in a zero return code.

Answer 2

To search for the file with the prefered case:
#echo off
set "res=" && for /f "delims=" %%i in ('dir "C:\Files" /b /a-d') do if "%%i"=="TESTFILE.txt" set "res=%%i"
if defined res (echo %res% Found) else (echo File not found)
still using for /f but without setting a variable:
#echo off
for /f "delims=" %%i in ('dir "C:\files" /b /a-d') do if "%%i"=="TESTFILE.txt" echo File found & goto :eof
echo File not found
or simply without /f but you would need to
#echo off
for %%i in (C:\Files\*) do if "%%i"=="TESTFILE.txt" echo File found & goto :eof
echo File not found