A serial or parallel Cfour run is carried out via
xcfour > output file
where this command can be performed either interactively (only recommended for very short runs), in the background (i.e., with &)
or within a shell script (required when using a queuing system). The name of the output file can be arbitrarily chosen.
As input files a CFOUR run requires
(a) a input file ZMAT with all information concerning geometry, requested quantum-chemical method, basis set, etc.
(b) the Basis-set file GENBAS.
Both files (ZMAT and GENBAS) must be in the directory xcfour is executed.