I need for a user2 to access user1 directory and files to run a program in user2 that cannot be ran by different users successfully. So I want to add user1 to the group user2 belongs to. I tried as root
usermod -a -G group user1
but its not adding user1 to group but no error is seen
groups user1 tells me it is in the group but none of the directories change to group
specifically I want access to a directory owned by user1 on a mounted drive
