The hash of a file's bytes, with the same algorithms and output formats
FileHash[file]
FileHash[file, "type"]
FileHash[file, "type", "format"]
FileHash[{file, range}, …]
FileHash[{filespec1, filespec2, …}, …]
Export["a.txt", "abc", "Text"]; FileHash["a.txt"]
→ 191415658344158766168031473277922803570Export["b.txt", "abc", "Text"]; FileHash["b.txt", "SHA256", "HexString"]
→ ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015adFileHash["no-such-file-here.txt"]
→
FileHash::noopen: Cannot open .*no-such-file-here.txt. (regex)
$Failed