is a variable defined in `
C source code
Its value is
Specifies whether to use the system's trash can.
When non-nil, certain file deletion commands use the function
`move-file-to-trash' instead of deleting files outright.
This includes interactive calls to `delete-file' and
`delete-directory' and the Dired deletion commands.
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 23.1 of Emacs.