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How can I search through a file to check to see if there are two lines that start with the same characters?

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Last Modified: 2015-10-14
At a command line in Windows, I want to search through a specific file and if it finds 2 instances of a line beginning with the same alphacharacters, then it needs to run a a specific vbs script.

For instance, in file located at c:\info\input.txt
Searching through the file,
If there are two lines in succession which start with DTM*, then it needs to run a cscript of 2.vbs, however if it finds
only 1 line starting with DTM* on it's own, then it needs to run 1.vbs.

What command line commands can I use to accomplish this?
Thanks.
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