How to delete content from a text file using windows batch script

Question

I have a demo.txt file. I need to delete content in that file using a batch file. Please tell me the command to delete content for demo.txt file.

Answer 1

If the file is used by another application command prompt redirection may fail (as it requires more file access then necessary). In that case you can use powershell:

PS> Set-Content file.txt $null

Note: do not expect that it will allow access to exclusively opened files.