![Forrest logo](/images/logo.png)
postgresql:export:csv
This command is written for the psql command-line tool, which is used to interact with PostgreSQL databases. The command supports several options to execute queries and redirect the output to a file.
Here is the breakdown of each component:
-
psql
: The command itself, used to invoke the psql tool. -
-d dbname
: Specifies the name of the database (dbname
) to connect to. -
-t
: This option stands for "tuples only" and is used to produce output in a table-like format. With this option, column names and footers are omitted. -
-A
: This option stands for "unaligned" and is used to produce output in an unaligned format, separating each field with the delimiter specified by the-F
option (in this case, a comma). This is useful when you want to process the output programmatically. -
-F","
: Specifies the field delimiter to be a comma (,
). This delimiter is used when outputting the query results in unaligned mode. -
-c "${query}"
: Executes the query specified by the${query}
variable. The curly braces$()
are used for command substitution, allowing the value of thequery
variable to be included in the command. -
> ${file_name}
: Redirects the output of the psql command to the file specified by the${file_name}
variable. The>
operator is used for output redirection.
Overall, this command connects to a PostgreSQL database, executes a specified query, formats the output as unaligned with comma delimiters, and saves the result in a file.