The echo line basically outputs, and I also replace my placeholders ( :) with newlines to make it look nice.Īlthough not strictly meeting the requirement for a batch script, I have used a single-line PowerShell script: Get-Childitem C:\MyDirectory -Recurse | WHERE | Group Extension -NoElement | Sort Count -Desc > FileExtensions.txt" So if it's not 0, the current extension is not on the list so far and should be added. %ERRORLEVEL% is set by the find command, a value of 0 indicates there was a match. Since we always append a : at the end of the list, we should also make sure the search query ends with a : so it doesn't match partial results - see comments. The text output of the find command is sent to nul, essentially a black hole - we don't want it. The whole current list if sent through a find command, to ensure uniqueness. %%~xi extracts the extension out of the full paths the dir command returns.Īn empty extension is replaced with "FileWithNoExtension", so you know there is such a file - if I added an empty line instead, it's not quite as obvious. The loop uses that dir /b /s /a:-d "%target%" command, grabbing a list of all files in all subdirectories under the target. Oh, and the %~1 means "get the first argument, removing quotes" which prevents doubled-up quotes - see for /?. line just sets things up: it gets the target directory to search, enables delayed expansion which lets me do update variables in the loop and defines a newline ( LF) that I can use for neater output. If you want to export to a file, use batchfile >filename.txt (or batchfile "path" >filename.txt). bat file, and run it with the command batchfile (substitute whatever you named it) to list the current directory, or specify a path with batchfile "path". If not !ERRORLEVEL! = 0 set extlist=!extlist!!ext!: If "!ext!"="" set ext=FileWithNoExtension In File Explorer under View, in the Show/hide group, select the File name extensions check box.īelow is a list of common Windows file name extensions and formats.Rem Previous two lines deliberately left blank for LF to work.įor /f "tokens=*" %%i in ('dir /b /s /a:-d "%target%"') do ( In the search box on the taskbar, type file explorer, and in the search results, select File Explorer. If you don’t see file name extensions when you view files in File Explorer: To learn more about how to change which program will open a file, read Change default programs in Windows 10. You can change a file name extension, but that won't convert the file to another format or change anything else about it except the file name. Most file name extensions are compatible with more than one program that you have installed. For example, the docx extension tells your computer that Microsoft Word can open the file and to display a Word icon when you view it in File Explorer. In expenses.xlsx, for example, the first part of the file name is expenses and the extension is xlsx.Įxtensions tell your computer which application created or can open the file and which icon to use for the file. Windows file names have two parts separated by a period: first, the file name, and second, a three- or four-character extension that defines the file type.
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