forfiles /p "C:\Users\" /s /m *.log /d -3 /c "cmd /c del @path"

This command is used to delete all .log files that are older than 3 days from the "C:\Users\" directory and its subdirectories.

Here's a breakdown of the command:

- "forfiles" is a command-line tool used to perform batch operations on files.
- "/p" specifies the path to search for files.
- "/s" tells the command to search for files in all subdirectories.
- "/m" specifies the file type to search for (in this case, "*.log" means all files with the extension .log).
- "/d -3" specifies the date range to search for files (in this case, files that are older than 3 days).
- "/c" specifies the command to execute on each file found.
- "cmd /c del @path" is the command to execute, which deletes the file (@path is a variable that represents the path to the file found by forfiles).