pg_dumpall:tldr:ef370

The command "pg_dumpall -s > ${output_file-sql}" is used to create a backup of all the database schemas in PostgreSQL and save it to a file.

Here is a breakdown of the command:

• "pg_dumpall" is the command-line utility provided by PostgreSQL to create backups of all databases.
• "-s" is an option that tells pg_dumpall to only include the database schemas in the backup, excluding the data. This is useful when you want to create a schema-only backup.
• ">" is a redirect operator used to redirect the output of the command to a file.
• "${output_file-sql}" is a variable that represents the name of the output file where the backup will be saved. The "-sql" extension is appended to the value of the variable to indicate that the backup file is in SQL format.

To use this command, you need to replace "${output_file-sql}" with the actual name and path of the file where you want to save the backup. For example, if you want to save the backup in a file named "backup.sql" in the current directory, you can run the command as:

pg_dumpall -s > backup.sql

Make sure you have the necessary permissions to execute the command and write to the specified file location.