Im running gnucash under Linux. Can I give another user access to my gnucash files?
Yes, as long as both of you do not access them at the same time. You do it the same way you’d share files of any type under Linux: put them in a folder that both of you have access to, and change the permissions so that you both can read from and write to the files. You really don’t want more than one person to have them open for editing at the same time, however, as whoever saves last will overwrite the changes of whoever saves first.