createdb:tldr:3dcee

The command "createdb --template=${template_name} ${database_name}" is used to create a new database in a PostgreSQL database management system.

Here's how the different parts of the command work:

• "createdb" is the command itself, which is used to create a new database.
• "--template=${template_name}" is an optional flag that specifies the template database to use for creating the new database. The "${template_name}" is a placeholder that should be replaced with the actual name of the template database. It allows you to create a database with the same structure and data as an existing database.
• "${database_name}" is the placeholder that should be replaced with the desired name for the new database. It represents the name you want to give to the newly created database.

For example, if you want to create a new database named "myappdb" using a template database named "mytemplate", you would execute the command as follows:

createdb --template=mytemplate myappdb

This would create a new database named "myappdb" based on the structure and data of the "mytemplate" database.