Deletion of Show tech

Comment: mdash; is not grounds for deletion, but lack of notability is.  The sources I'm finding in google books only discuss the use of the command.  I'm not seeing a broader discussion of why the command is important, its history, competing approaches, etc. that could be used to write an encyclopedic article.  In the absence of those kinds of sources, I don't see a clear path to 
Stance: delete
Cited policy: Wikipedia:Manual of Style (WP:MANUAL||WP:NOTABILITY)