PostgreSQL - query from bash script as database user 'postgres'

Question

I have a table in my PostgreSQL database which has 3 columns - c_uid, c_defaults and c_settings. c_uid simply stores the

Answer 1

In my case the best solution including the requirement for authentication is:

username="admin"
new_password="helloworld"

PGPASSWORD=DB_PASSWORD \
  psql -h HOSTNAME -U DB_USERNAME -d DATABASE_NAME -c \
  "UPDATE user SET password = '$new_password' WHERE username = '$username'"

This command will update a password of a user e.g. for recovery case.

Info: The trade-off here is that you need to keep in mind that the password will be visible in the bash history. For more information see here.

Update: I'm running the databse in a docker container and there I just need the commmand: docker exec -i container_name psql -U postgres -d postgres -c "$SQL_COMMAND"

Answer 2

Try this one:

#!/bin/bash
psql -U postgres -d database_name -c "SELECT c_defaults  FROM user_info WHERE c_uid = 'testuser'"

Or using su:

#!/bin/bash
su -c "psql -d database_name -c \"SELECT c_defaults  FROM user_info WHERE c_uid = 'testuser'\"" postgres

And also sudo:

#!/bin/bash
sudo -u postgres -H -- psql -d database_name -c "SELECT c_defaults  FROM user_info WHERE c_uid = 'testuser'"