Are you sure .viminfo is a binary file? I'm not a vim user, but having a look at one lying around, it seems to be an ordinary text file.

Thanks samcarter‭c, it is, but barely. With your hint I could write a solution. I guess we make a good team ;)

Quasímodo‭, aside from directly editing .viminfo (which shouldn't be too difficult, as it is a text file; just make sure to use the proper text encoding vim used for saving this file when editing it), there is also the vim script function histdel which allows deleting entries from the command history (and from other histories such as vim's search history, for example) https://vimhelp.org/eval.txt.html#histdel%28%29. However, if you use a vim build that has expression evaluation disabled, this function is not available. (No, like @samcarter, i am not a vim user either, so i can't provide specific detail information about histdel aside from what is written in the documentation i linked to...)

elgonzo‭ It is not a text file, although some parts of it are plain text, so it is really not that difficult. histdel looks good indeed, but it works with regular expressions, which makes it a considerably more error-prone than editing .viminfo by hand.

Quasímodo‭ Glad to hear you could solve your problem :)