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mongo
mongo
¶
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Description¶
-
mongo
¶
mongo
is an interactive JavaScript shell interface to
MongoDB, which provides a powerful interface for systems
administrators as well as a way for developers to test queries and
operations directly with the database. mongo
also provides
a fully functional JavaScript environment for use with a MongoDB. This
document addresses the basic invocation of the mongo
shell
and an overview of its usage.
See also
In addition to this page, consider Using the mongo Shell section of the manual.
Synopsis¶
-
mongo [--shell] [--nodb] [--norc] [--quiet] [--port <port>] [--host <host>] [--eval <JavaScript>] [-u <username>] [--username <username>] [-p <password>] [--password <password>] [--help] [-h] [--version] [--verbose] [--ipv6] [database] [file.js]
Interface¶
Options¶
-
--shell
¶
Enables the shell interface after evaluating a JavaScript file. If you invoke the
mongo
command and specify a JavaScript file as an argument, or use--eval
to specify JavaScript on the command line, the--shell
option provides the user with a shell prompt after the file finishes executing.
-
--nodb
¶
Prevents the shell from connecting to any database instances. Later, to connect to a database within the shell, see Opening New Connections.
-
--norc
¶
Prevents the shell from sourcing and evaluating
~/.mongorc.js
on start up.
-
--quiet
¶
Silences output from the shell during the connection process.
-
--port
<port>
¶ Specifies the port where the
mongod
ormongos
instance is listening. Unless specifiedmongo
connects tomongod
instances on port27017
, which is the defaultmongod
port.
-
--host
<hostname>
¶ specifies the host where the
mongod
ormongos
is running to connect to as<hostname>
. By defaultmongo
will attempt to connect to a MongoDB process running on the localhost.
-
--eval
<javascript>
¶ Evaluates a JavaScript expression specified as an argument to this option.
mongo
does not load its own environment when evaluating code: as a result many options of the shell environment are not available.
-
--username
<username>
,
-u
<username>
¶ Specifies a username to authenticate to the MongoDB instance. Use in conjunction with the
--password
option to supply a password. If you specify a username and password but the default database or the specified database do not require authentication,mongo
will exit with an exception.
-
--password
<password>
,
-p
<password>
¶ Specifies a password to authenticate to the MongoDB instance. Use in conjunction with the
--username
option to supply a username. If you specify a--username
without the--password
option,mongo
will prompt for a password interactively, if themongod
ormongos
requires authentication.
-
--help
,
-h
¶
Returns a basic help and usage text.
-
--version
¶
Returns the version of the shell.
-
--verbose
¶
Increases the verbosity of the output of the shell during the connection process.
-
--ipv6
¶
Enables IPv6 support that allows
mongo
to connect to the MongoDB instance using an IPv6 network. All MongoDB programs and processes, includingmongo
, disable IPv6 support by default.
-
<db
address>
¶ Specifies the “database address” of the database to connect to. For example:
The above command will connect the
mongo
shell to the admin database on the local machine. You may specify a remote database instance, with the resolvable hostname or IP address. Separate the database name from the hostname using a/
character. See the following examples:
Files¶
~/.dbshell
mongo
maintains a history of commands in the.dbshell
file.Note
mongo
does not recorded interaction related to authentication in the history file, includingauthenticate
anddb.addUser()
.Warning
Versions of Windows
mongo.exe
earlier than 2.2.0 will save the .dbshell file in themongo.exe
working directory.
~/.mongorc.js
mongo
will read the.mongorc.js
file from the home directory of the user invokingmongo
. In the file, users can define variables, customize themongo
shell prompt, or update information that they would like updated every time they launch a shell. If you use the shell to evaluate a JavaScript file or expression either on the command line with--eval
or by specifying a .js file to mongo,mongo
will read the.mongorc.js
file after the JavaScript has finished processing.Specify the
--norc
option to disable reading.mongorc.js
.
/tmp/mongo_edit<time_t>.js
%TEMP%mongo_edit<time_t>.js
Created bymongo.exe
on Windows when editing a file. If the file existsmongo
will append an integer from1
to10
to the time value to attempt to create a unique file.
Environment¶
-
EDITOR
¶ Specifies the path to an editor to use with the
edit
shell command. A JavaScript variableEDITOR
will override the value ofEDITOR
.
-
HOME
¶ Specifies the path to the home directory where
mongo
will read the.mongorc.js
file and write the.dbshell
file.
Keyboard Shortcuts¶
The mongo
shell supports the following keyboard shortcuts:
[1]
Keybinding | Function |
---|---|
Up arrow | Retrieve previous command from history |
Down-arrow | Retrieve next command from history |
Home | Go to beginning of the line |
End | Go to end of the line |
Tab | Autocomplete method/command |
Left-arrow | Go backward one character |
Right-arrow | Go forward one character |
Ctrl-left-arrow | Go backward one word |
Ctrl-right-arrow | Go forward one word |
Meta-left-arrow | Go backward one word |
Meta-right-arrow | Go forward one word |
Ctrl-A | Go to the beginning of the line |
Ctrl-B | Go backward one character |
Ctrl-C | Exit the mongo shell |
Ctrl-D | Delete a char (or exit the mongo shell) |
Ctrl-E | Go to the end of the line |
Ctrl-F | Go forward one character |
Ctrl-G | Abort |
Ctrl-J | Accept/evaluate the line |
Ctrl-K | Kill/erase the line |
Ctrl-L or type cls |
Clear the screen |
Ctrl-M | Accept/evaluate the line |
Ctrl-N | Retrieve next command from history |
Ctrl-P | Retrieve previous command from history |
Ctrl-R | Reverse-search command history |
Ctrl-S | Forward-search command history |
Ctrl-T | Transpose characters |
Ctrl-U | Perform Unix line-discard |
Ctrl-W | Perform Unix word-rubout |
Ctrl-Y | Yank |
Ctrl-Z | Suspend (job control works in linux) |
Ctrl-H | Backward-delete a character |
Ctrl-I | Complete, same as Tab |
Meta-B | Go backward one word |
Meta-C | Capitalize word |
Meta-D | Kill word |
Meta-F | Go forward one word |
Meta-L | Change word to lowercase |
Meta-U | Change word to uppercase |
Meta-Y | Yank-pop |
Meta-Backspace | Backward-kill word |
Meta-< | Retrieve the first command in command history |
Meta-> | Retrieve the last command in command history |
[1] | MongoDB accommodates multiple keybinding.
Since 2.0, mongo includes support for basic emacs
keybindings. |
Use¶
Typically users invoke the shell with the mongo
command at
the system prompt. Consider the following examples for other
scenarios.
To connect to a database on a remote host using authentication and a non-standard port, use the following form:
Alternatively, consider the following short form:
Replace <user>
, <pass>
, and <host>
with the appropriate
values for your situation and substitute or omit the --port
as needed.
To execute a JavaScript file without evaluating the ~/.mongorc.js
file before starting a shell session, use the following form:
To print return a query as JSON, from the system prompt using
the --eval
option, use the following form:
Use single quotes (e.g. '
) to enclose the JavaScript, as well as
the additional JavaScript required to generate this output.