title: how we can save database created in sqlite3
body: <p>I am new to database. I am trying to create a database and table in it.
  but unable to save and open again after exiting from sqlite.
  I am using  sqlite3 3.6.20 on centOS, when i will enter following command</p>
  
  <pre><code>.save ex1.db or .open ex1.db
  </code></pre>
  
  <p>it will print following error message.</p>
  
  <pre><code>Error: unknown command or invalid arguments:  "save". Enter ".help" for help
  Error: unknown command or invalid arguments:  "open". Enter ".help" for help
  </code></pre>
  
  <p>and when Print .help
  it wont show any command related to save and open existing database.
  thanks in advance.</p>