tldr/pages/common/duckdb.md

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# duckdb
> Command-line client for DuckDB, an in-process analytical SQL engine.
> More information: <https://duckdb.org>.
- Start an interactive shell with a transient in-memory database:
`duckdb`
- Start an interactive shell on a database file. If the file does not exist, a new database is created:
`duckdb {{path/to/dbfile}}`
- Directly query a CSV, JSON, or Parquet file:
`duckdb -c "{{SELECT * FROM 'data_source.[csv|csv.gz|json|json.gz|parquet]'}}"`
- Run an SQL script:
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`duckdb -c ".read {{path/to/script.sql}}"`
- Run query on database file and keep the interactive shell open:
`duckdb {{path/to/dbfile}} -cmd "{{SELECT DISTINCT * FROM tbl}}"`
- Run SQL queries in file on database and keep the interactive shell open:
`duckdb {{path/to/dbfile}} -init {{path/to/script.sql}}`
- Read CSV from `stdin` and write CSV to `stdout`:
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`cat {{path/to/source.csv}} | duckdb -c "{{COPY (FROM read_csv('/dev/stdin')) TO '/dev/stdout' WITH (FORMAT CSV, HEADER)}}"`
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- Display help:
`duckdb -help`