Dear all, 

I'm trying to dump my database using the following command after I enter as su 
postgres:

pg_dump - U postgres mydb -f mydb.sql 

... but I'm always having the following message: 

pg_dump [archiver] Could not open output file "mydb.sql" : Permission denied

I try to use the same statement using su.. but I didn't manage. Can someone 
give me a help?

I'm using Ubuntu 12.04 LTS and Postgres 9.1.

Kind Regards,
José Santos 
                                          

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