Duplicate Database

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Hello to everyone,

I have a application using Postgres DB and I going to create a new version
on the same server... I would like duplicate my database with all structure
and data
like that, I can update this new version and  keep the last one active
during the release version.

BUT, doesm't work =(

First I create the backup, like that :
pg_dump > db.out


After I try to duplicate this one :

So I create a other user "new-user" and I create a new db "new-db" (new-user
is the owner new-db)
next step :
change 1 ligne on db.out file :
Replace :  "\connect - dbname"   by  "\connect - new-db"

To finish, I try that :
    psql  new-db< db.out



Of course, it doesn't work, otherwise I won't disturb you =)

Error message:
1: You are now connected as new user new-db
2: ERROR:  Relation 'table1' already exists
3: ERROR:  Relation 'table1' already exists
4: ...



I tried a lot of think without success, Some helpsssssssss pleaseee.



Thanks to the community, Areski






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