title: Eliminate single quoted strings using SED in UNIX
body: <p>In my file I have the contents like below.</p>
  
  <pre><code>&lt;sql type="cognos"&gt;SELECT * FROM  [PG WIND JAROS - JAROSODS].AGREMENT_MAS WHERE FILTER = 'Saravana' and ADDress = '32/36 Abc Nagar CH' &lt;/sql&gt;
  &lt;sql type="cognos"&gt;select OBJECT_TYPE           'Object Type',
   OBJECT_NAME            "Object Name",
  from [PG WIND Jaros - JAROSDM].CX_WIND_LOOKUP_REF WHERE Filter = 'Kumaar' and STATUS = 'RICH' &lt;/sql&gt;
  </code></pre>
  
  <p>Here I have to convert everything to lower case except strings in single quotes. i.e.,</p>
  
  <p>output:</p>
  
  <pre><code>&lt;sql type="cognos"&gt;select * from  [pg wind jaros - jarosods].agrement_mas where filter = 'Saravana' and address = '32/36 Abc Nagar CH' &lt;/sql&gt;
  &lt;sql type="cognos"&gt;select object_type           'Object Type',
   object_name            "object name",
  from [pg wind jaros - jarosdm].cx_wind_lookup_ref where filter = 'Kumaar' and status = 'RICH' &lt;/sql&gt;
  </code></pre>
  
  <p>How can I acheive this in SED ? Please help me .....</p>