Running Slackware-14.2/x86_64. Current installation is postgres-11.5 and I'm
upgrading to postgresql-12.1. Both versions are installed and stopped.
If I have correctly read the pg_upgrade manual page this is the command to
use (as user postgres) with lines split to fit the message; the command will
be on a single line:
pg_upgrade \
-b /usr/lib64/postgresql/11/bin/ \
-B /usr/lib64/postgesql/12/bin/ \
-d /var/lib/pgsql/11/data/ \
-D /var/lib/pgsql/12/data/ \
-p 5432 \
-P 5432
I don't know that the port numbers are required.
Have I missed an option?
Rich