How to duplicate schemas in PostgreSQL

Question

I have a database with schema public and schema_A. I need to create a new schema schema_b with the same structure than schema_a

Answer 1

Just ran into same. Sometimes I am missing remap_schema :)
The problem - neither from above addresses the Fc - standard format which is crucial for large schemas.
So I came up with something which uses it :
Pseudo code below - should work.
Requires rename of source for duration of pg_dump which, of course, might not be an option :(
Source :

pg_dump --pre-data in sql format
psql rename sosurce to target
pg_dump -Fc --data-only
psql rename back
pg_dump --post-data in sql format

Target :

sed source_schema->target_schema pre-data sql |psql
pg_restore Fc dump
sed source_schema->target_schema post-data sql |psql

sed above usually will include any other manipulations ( say different user names between source and target ) But it will be way much faster as data will not be part of the file