case "$all,$interactive,$also,$#" in
*t,*t,*)
die "Cannot use -a, --interactive or -i at the same time." ;;
-t,,[1-9]*)
+t,,,[1-9]*)
die "Paths with -a does not make sense." ;;
-,t,[1-9]*)
+,t,,[1-9]*)
die "Paths with --interactive does not make sense." ;;
,,t,0)
die "No paths with -i does not make sense." ;;