How to get pathname of viminfo file after vim started

Question

If vim started with vim -i ~/tmp/.viminfo, how can I extract that pathname after vim started?

Since upon exiting vim, history, mark, buf-list, etc will automatically write to that file, thus it must be stored somewhere.

The question is: how can I get that pathname?

　　 

Answer 1

See the viminfofile option (:help viminfofile), which is set when using the -i command line flag.