Reading PGN files using thr Stockfish engine Is there a way to read a PGN file using the Stockfish engine? If so, please give a sample command.
Stockfish is an engine that's called by apps that read PGN files, it doesn't read the PGN data itself. 

There are many very good free apps that can read PGN files and analyse the games they contain using Stockfish (which is also free) and/or similar engines (mostly not free)

A lot of good free PGN reader apps that are able to call Stockfish can be downloaded and installed from SourceForge, such as

ChessX An old app but a good one

Scid The most popular app on SourceForge at the time of writing

PGN ChessBook Which comes with the requested Stockfish engine built in

If you search for "pgn" on SourceForge you should find more apps, but in my opinion these are the best ones currently available.