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Dot Commands

Dot commands are available in the DuckDB CLI client. To use one of these commands, begin the line with a period (.) immediately followed by the name of the command you wish to execute. Additional arguments to the command are entered, space separated, after the command. If an argument must contain a space, either single or double quotes may be used to wrap that parameter. Dot commands must be entered on a single line, and no whitespace may occur before the period. No semicolon is required at the end of the line. To see available commands, use the .help command.

List of Dot Commands

Command Description
.bail on|off Stop after hitting an error. Default: off
.binary on|off Turn binary output on or off. Default: off
.cd DIRECTORY Change the working directory to DIRECTORY
.changes on|off Show number of rows changed by SQL
.columns Column-wise rendering of query results
.constant COLOR Sets the syntax highlighting color used for constant values
.constantcode CODE Sets the syntax highlighting terminal code used for constant values
.databases List names and files of attached databases
.echo on|off Turn command echo on or off
.exit CODE Exit this program with return-code CODE
.headers on|off Turn display of headers on or off. Does not apply to duckbox mode
.help -all PATTERN Show help text for PATTERN
.highlight on|off Toggle syntax highlighting in the shell on / off. See the query syntax highlighting section for more details
.highlight_colors COMPONENT COLOR Configure the color of each component in (duckbox only). See the result syntax highlighting section for more details
.highlight_results on|off Toggle highlighting in result tables on / off (duckbox only). See the result syntaxx highlighting section for more details
.import FILE TABLE Import data from FILE into TABLE
.indexes TABLE Show names of indexes
.keyword COLOR Sets the syntax highlighting color used for keywords
.keywordcode CODE Sets the syntax highlighting terminal code used for keywords
.large_number_rendering all|footer|off Toggle readable rendering of large numbers (duckbox only, default: footer)
.log FILE|off Turn logging on or off. FILE can be stderr / stdout
.maxrows COUNT Sets the maximum number of rows for display. Only for duckbox mode
.maxwidth COUNT Sets the maximum width in characters. 0 defaults to terminal width. Only for duckbox mode
.mode MODE TABLE Set output mode
.multiline Set multi-line mode (default)
.nullvalue STRING Use STRING in place of NULL values. Default: NULL
.once OPTIONS FILE Output for the next SQL command only to FILE
.open OPTIONS FILE Close existing database and reopen FILE
.output FILE Send output to FILE or stdout if FILE is omitted
.print STRING... Print literal STRING
.prompt MAIN CONTINUE Replace the standard prompts
.quit Exit this program
.read FILE Read input from FILE
.rows Row-wise rendering of query results (default)
.safe_mode Activates safe mode
.schema PATTERN Show the CREATE statements matching PATTERN
.separator COL ROW Change the column and row separators
.shell CMD ARGS... Run CMD with ARGS... in a system shell
.show Show the current values for various settings
.singleline Set single-line mode
.system CMD ARGS... Run CMD with ARGS... in a system shell
.tables TABLE List names of tables matching LIKE pattern TABLE
.timer on|off Turn SQL timer on or off. SQL statements separated by ; but not separated via newline are measured together
.width NUM1 NUM2 ... Set minimum column widths for columnar output

Using the .help Command

The .help text may be filtered by passing in a text string as the first argument.

.help m
.maxrows COUNT           Sets the maximum number of rows for display (default: 40). Only for duckbox mode.
.maxwidth COUNT          Sets the maximum width in characters. 0 defaults to terminal width. Only for duckbox mode.
.mode MODE ?TABLE?       Set output mode

.output: Writing Results to a File

By default, the DuckDB CLI sends results to the terminal's standard output. However, this can be modified using either the .output or .once commands. Pass in the desired output file location as a parameter. The .once command will only output the next set of results and then revert to standard out, but .output will redirect all subsequent output to that file location. Note that each result will overwrite the entire file at that destination. To revert back to standard output, enter .output with no file parameter.

In this example, the output format is changed to markdown, the destination is identified as a Markdown file, and then DuckDB will write the output of the SQL statement to that file. Output is then reverted to standard output using .output with no parameter.

.mode markdown
.output my_results.md
SELECT 'taking flight' AS output_column;
.output
SELECT 'back to the terminal' AS displayed_column;

The file my_results.md will then contain:

| output_column |
|---------------|
| taking flight |

The terminal will then display:

|   displayed_column   |
|----------------------|
| back to the terminal |

A common output format is CSV, or comma separated values. DuckDB supports SQL syntax to export data as CSV or Parquet, but the CLI-specific commands may be used to write a CSV instead if desired.

.mode csv
.once my_output_file.csv
SELECT 1 AS col_1, 2 AS col_2
UNION ALL
SELECT 10 AS col1, 20 AS col_2;

The file my_output_file.csv will then contain:

col_1,col_2
1,2
10,20

By passing special options (flags) to the .once command, query results can also be sent to a temporary file and automatically opened in the user's default program. Use either the -e flag for a text file (opened in the default text editor), or the -x flag for a CSV file (opened in the default spreadsheet editor). This is useful for more detailed inspection of query results, especially if there is a relatively large result set. The .excel command is equivalent to .once -x.

.once -e
SELECT 'quack' AS hello;

The results then open in the default text file editor of the system, for example:

cli_docs_output_to_text_editor

Tip macOS users can copy the results to their clipboards using pbcopy by using .once to output to pbcopy via a pipe: .once |pbcopy

Combining this with the .headers off and .mode lines options can be particularly effective.

Querying the Database Schema

All DuckDB clients support querying the database schema with SQL, but the CLI has additional dot commands that can make it easier to understand the contents of a database. The .tables command will return a list of tables in the database. It has an optional argument that will filter the results according to a LIKE pattern.

CREATE TABLE swimmers AS SELECT 'duck' AS animal;
CREATE TABLE fliers AS SELECT 'duck' AS animal;
CREATE TABLE walkers AS SELECT 'duck' AS animal;
.tables
fliers    swimmers  walkers

For example, to filter to only tables that contain an l, use the LIKE pattern %l%.

.tables %l%
fliers   walkers

The .schema command will show all of the SQL statements used to define the schema of the database.

.schema
CREATE TABLE fliers (animal VARCHAR);
CREATE TABLE swimmers (animal VARCHAR);
CREATE TABLE walkers (animal VARCHAR);

Syntax Highlighters

The DuckDB CLI client has a syntax highlighter for the SQL queries and another for the duckbox-formatted result tables.

Configuring the Query Syntax Highlighter

By default the shell includes support for syntax highlighting. The CLI's syntax highlighter can be configured using the following commands.

To turn off the highlighter:

.highlight off

To turn on the highlighter:

.highlight on

To configure the color used to highlight constants:

.constant [red|green|yellow|blue|magenta|cyan|white|brightblack|brightred|brightgreen|brightyellow|brightblue|brightmagenta|brightcyan|brightwhite]
.constantcode ⟨terminal_code⟩

For example:

.constantcode 033[31m

To configure the color used to highlight keywords:

.keyword [red|green|yellow|blue|magenta|cyan|white|brightblack|brightred|brightgreen|brightyellow|brightblue|brightmagenta|brightcyan|brightwhite]
.keywordcode ⟨terminal_code⟩

For example:

.keywordcode 033[31m

Configuring the Result Syntax Highlighter

By default, the result highlighting makes a few small modifications:

  • Bold column names
  • NULL values are greyed out
  • Layout elements are grayed out

The highlighting of each of the components can be customized using the .highlight_colors command. For example:

.highlight_colors layout red
.highlight_colors column_type yellow
.highlight_colors column_name yellow bold_underline
.highlight_colors numeric_value cyan underline
.highlight_colors temporal_value red bold
.highlight_colors string_value green bold
.highlight_colors footer gray

The result highlighting can be disabled using .highlight_results off.

Shorthands

DuckDB's CLI allows using shorthands for dot commands. Once a sequence of characters can unambiguously completed to a dot command or an argument, the CLI (silently) autocompletes them. For example:

.mo ma

Is equivalent to:

.mode markdown

Tip Avoid using shorthands in SQL scripts to improve readability and ensure that the scripts and futureproof.

Importing Data from CSV

Deprecated This feature is only included for compatibility reasons and may be removed in the future. Use the read_csv function or the COPY statement to load CSV files.

DuckDB supports SQL syntax to directly query or import CSV files, but the CLI-specific commands may be used to import a CSV instead if desired. The .import command takes two arguments and also supports several options. The first argument is the path to the CSV file, and the second is the name of the DuckDB table to create. Since DuckDB requires stricter typing than SQLite (upon which the DuckDB CLI is based), the destination table must be created before using the .import command. To automatically detect the schema and create a table from a CSV, see the read_csv examples in the import docs.

In this example, a CSV file is generated by changing to CSV mode and setting an output file location:

.mode csv
.output import_example.csv
SELECT 1 AS col_1, 2 AS col_2 UNION ALL SELECT 10 AS col1, 20 AS col_2;

Now that the CSV has been written, a table can be created with the desired schema and the CSV can be imported. The output is reset to the terminal to avoid continuing to edit the output file specified above. The --skip N option is used to ignore the first row of data since it is a header row and the table has already been created with the correct column names.

.mode csv
.output
CREATE TABLE test_table (col_1 INTEGER, col_2 INTEGER);
.import import_example.csv test_table --skip 1

Note that the .import command utilizes the current .mode and .separator settings when identifying the structure of the data to import. The --csv option can be used to override that behavior.

.import import_example.csv test_table --skip 1 --csv