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To count the number of lines in a file using DOS, use the following command. Replace filename.txt with the actual filename.

findstr /R /N "^" filename.txt | find /C ":"

This is especially useful when the file is very large (say, over 250k lines) and using NotePad to open the file would definitely hang. Just tested the command on a 1.4M lines file and it took about 2 minutes to give me the result.

Reference: http://brett.batie.com/?p=25