name: hashFile args: [type, p]
Return a base-16 representation of the cryptographic hash of the
file at path p. The hash algorithm specified by type must be one
of "md5", "sha1", "sha256" or "sha512".
Return a base-16 representation of the cryptographic hash of the
file at path p. The hash algorithm specified by type must be one
of "md5", "sha1", "sha256" or "sha512".