SQL Server Express LocalDB Command Line Tool Version %1!u!.%2!u!.%3!u!.%4!u! Microsoft Corporation. . Usage: SqlLocalDB operation ...

Microsoft (R) SQL Server Express LocalDB Command Line Tool
Version %1!u!.%2!u!.%3!u!.%4!u!
Copyright (c) Microsoft Corporation.  All rights reserved.

Usage: SqlLocalDB operation [parameters...]

Operations:
 
  -?
    Prints this information

  create|c "instance name" [version-number] [-s]
    Creates a new LocalDB instance with a specified name and version
    If the [version-number] parameter is omitted, it defaults to the
    SqlLocalDB product version.
    -s starts the new LocalDB instance after it's created

  delete|d "instance name"
    Deletes the LocalDB instance with the specified name

  start|s "instance name"
    Starts the LocalDB instance with the specified name
 
  stop|p "instance name" [-i|-k]
    Stops the LocalDB instance with the specified name, 
    after current queries finish
    -i request LocalDB instance shutdown with NOWAIT option
    -k kills LocalDB instance process without contacting it

  share|h ["owner SID or account"] "private name" "shared name"
    Shares the specified private instance using the specified shared name. 
    If the user SID or account name is omitted, it defaults to current user.

  unshare|u "shared name"
    Stops the sharing of the specified shared LocalDB instance.

  info|i
    Lists all existing LocalDB instances owned by the current user
    and all shared LocalDB instances.

  info|i "instance name"
    Prints the information about the specified LocalDB instance.

  versions|v
    Lists all LocalDB versions installed on the computer.

  trace|t on|off
    Turns tracing on and off

SqlLocalDB treats spaces as delimiters. It is necessary to surround 
instance names that contain spaces and special characters with quotes. 
For example: 
SqlLocalDB create "My LocalDB Instance"