sudo -i specifically invokes login shell: > Run the shell specified by the target user's password database entry as a login shell. Contrast to -s option: > R

sudo -i specifically invokes login shell: > Run the shell specified by the target user's password database entry as a login shell. Contrast to -s option: > Run the shell specified by the SHELL environment variable if it is set or the shell specified by the invoking user's password database entry