Take a look at  Android app. This app provides all 18t Chapters. This doesn't provides searching option but it is easy to copy paste the text from the app and pasting in a text file and then you can search. Since 18th Chapter is not available on GRETIL it is not that hassle to copy paste only one chapter
https://play.google.com/store/apps/details?id=in.lucidify.bhagavadgita

On 24-Feb-2018 7:54 AM, "David and Nancy Reigle via INDOLOGY" <indology@list.indology.info> wrote:
Dear Madhav,

GRETIL has a searchable file of adhyayas 1-17 here:

http://gretil.sub.uni-goettingen.de/gretil/1_sanskr/6_sastra/3_phil/vedanta/bhgsbh_u.htm

Best regards,

David Reigle
Colorado, U.S.A.

On Fri, Feb 23, 2018 at 7:15 PM, Madhav Deshpande via INDOLOGY <indology@list.indology.info> wrote:
Dear Colleagues,

     Is there a searchable text of Śaṅkara's commentary on the Bhagavadgītā?  Please let me know if there is such a file that I can access.  Thanks.

Madhav Deshpande
Campbell, California

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