I want to check a certain file extension in the folder using batch script
Its like,
if exist <any file with extension .elf>
do something
else
do something else
Here file name may be anything but only extension(.elf) is important
In the simplest case the batch language includes a construct for this task
if exist *.elf (
:: file exists - do something
) else (
:: file does not exist - do something else
)
where the if exist will test for existence of an element in the current or indicate folder that matches the indicated name/wildcard expression.
While in this case it seems you will not need anything else, you should take into consideration that if exist makes no difference between a file and a folder. If the name/wildcard expression that you are using matches a folder name, if exists will evaluate to true.
How to ensure we are testing for a file? The easiest solution is to use the dir command to search for files (excluding folders). If it fails (raises errorlevel), there are no files matching the condition.
dir /a-d *.elf >nul 2>&1
if errorlevel 1 (
:: file does not exist - do something
) else (
:: file exists - do something else
)
Or, using conditional execution (just a little abreviation for the above code)
dir /a-d *.elf >nul 2>&1 && (
:: file does exist - do something
) || (
:: file does not exist - do something else
)
What it does is execute a dir command searching for *.elf , excluding folders (/a-d) and sending all the output to nul device, that is, discarding the output. If errorlevel is raised, no matching file has been found.
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