The opcodes for file input and output are:
- File open/close: fiopen and ficlose.
- File output: dumpk, dumpk2, dumpk3, dumpk4, fout, fouti, foutir, foutk and hdf5write
- File input: readf, readfi, readk, readk2, readk3, readk4, fin, fini and fink
- Utilities for use with the fout opcodes: clear, vincr
- Printing to a file: fprints and fprintks