Final answer:
To import a tar file in PostgreSQL, you can use the pg_restore command-line tool.
Step-by-step explanation:
In order to import a tar file in PostgreSQL, you can use the pg_restore command-line tool. This tool is used to restore a PostgreSQL database from an archive created by the pg_dump tool. To import a tar file, navigate to the directory where the tar file is located and run the following command:
pg_restore -U <username> -d <database_name> <tar_file>
Replace <username> with your PostgreSQL username, <database_name> with the name of the database you want to import into, and <tar_file> with the name of the tar file you want to import.