$ /usr/pgsql-12/bin/pg_upgrade \
> -b /usr/pgsql-1
pgsql-10/ pgsql-12/
> -b /usr/pgsql-10/bin/ \
> -B /usr/pgsql-12/bin/ \
> -d /var/lib/pgsql/1
10/ 12/
> -d /var/lib/pgsql/10/data/ \
> -D /var/lib/pgsql/12/data/ \
> --check
Performing Consistency Checks
-----------------------------
Checking cluster versions ok
Checking database user is the install user ok
Checking database connection settings ok
Checking for prepared transactions ok
Checking for system-defined composite types in user tables ok
Checking for reg* data types in user tables ok
Checking for contrib/isn with bigint-passing …
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