# Running PREFEKO

Use PREFEKO with the correct syntax and optional parameters for advanced control.

PREFEKO creates a .fek file ready for solving by the Feko solver from a .pre input file. PREFEKO is started using the following command:
prefeko example

where example is the .pre input file.

The component PREFEKO allows a number of options, which are mainly used for debugging purposes. Entering PREFEKO without arguments will give an overview of the syntax and supported options.

The options available for PREFEKO are as follows:

--version
Print the version information and then exit.
--fek-format x
Write the .fek file in the xth file format.
-#var=value
Set a variable #var to the value value.
--ignore-errors
Treat error messages as non-fatal. PREFEKO will continue with the processing after encountering errors. This can result in more errors as a consequence of the first one, but it could also be useful to see all geometry modelling errors at once, and not only the first one.
--print-variables
Print a list of all variables (name, value, comment) to stdout. The output also includes info whether the variable is set for the first time or whether the value of an existing variable is changed.
--print-variables-to-out
Print a list of all variables (name, value, comment) to the Feko output file (.out). The output also includes info whether the variable is set for the first time or whether the value of an existing variable is changed.
When defining variables from the command line, for example calling PREFEKO with
prefeko filename -#variable1=value1 -#variable2=value2 ...

it is recommended to use the !!print_to_out command to write these variables to the output file in order to keep a record of their values.