File open/close: fiopen and ficlose.

File output: dumpk, dumpk2, dumpk3, dumpk4, fout, fouti, foutir foutk and hdf5write

File input: readk, readk2, readk3, readk4, fin, fini and fink

Utilities for use with the fout opcodes: clear, vincr

Printing to a file: fprints and fprintks