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Drag and drop files onto batch script to add file extension #

Appends ".jpg" to files dragged and dropped onto the saved script's icon:

@echo on
for %%I in (%*) do ren %%I "%%~nI.jpg"
pause

From Microsoft's 'for' documentation:

• Use a single percent sign (%) to carry out the for command at the command prompt. Use double percent signs (%%) to carry out the for command within a batch file.
• You can use wildcard characters (* and ?) to specify a file set.
• %~nI Expands %I to a file name only.

Simple, but perhaps a trifle cavalier, without any sanity checks or filetype awareness. By leveraging exiftool, we can improve on things a bit:

@echo on
for %%I in (%*) do exiftool.exe "-filename<$filename.$filetypeextension" -r -ext . %%I
pause

• only processes files missing an extension
• appends correct file extension to supported file types
• handles files, directories, and subdirectories properly

H/T:

• Run command with drag and drop onto batch file
• Error "The syntax of the command is incorrect" when renaming a file
• Get filename in batch for loop

/windows | Nov 20, 2021

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