file_print_level:

Verbosity level for output file. $\;$
NOTE: This option only works when read from the ipopt.opt options file! Determines the verbosity level for the file specified by "output_file". By default it is the same as "print_level". The valid range for this integer option is $0 \le {\tt file\_print\_level } \le 12$ and its default value is $5$ .