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Here is a summary of all of Octave's built-in variables along with
cross references to additional information and their default values.  In
the following table octave-home stands for the root directory
where all of Octave is installed (the default is /usr/local,
version stands for the Octave version number (for example,
2.9.19) and arch stands for the type of system for which
Octave was compiled (for example, x86_64-unknown-linux-gnu).
     
EDITORDefault value: "emacs".
     
EXEC_PATHDefault value: ":$PATH".
     
OCTAVE_HOME"/usr/local".
     PAGERDefault value: "less", or "more".
     
PS1Default value: "\s:\#> ".
     
PS2Default value: "> ".
     
PS4Default value: "+ ".
     
beep_on_errorDefault value: 0.
     
completion_append_charDefault value: " ".
     
default_save_optionsDefault value: "ascii".
     
crash_dumps_octave_coreDefault value: 1.
     
fixed_point_formatDefault value: 0.
     
gnuplot_binaryDefault value: "gnuplot".
     
history_fileDefault value: "~/.octave_hist".
     
history_sizeDefault value: 1024.
     
ignore_function_time_stampDefault value: "system".
     
max_recursion_depthDefault value: 256.
     
output_max_field_widthDefault value: 10.
     
output_precisionDefault value: 5.
     
page_screen_outputDefault value: 1.
     
print_answer_id_nameDefault value: 1.
     
print_empty_dimensionsDefault value: 1.
     
return_last_computed_valueDefault value: 0.
     
save_precisionDefault value: 17.
     
saving_historyDefault value: 1.
     
sighup_dumps_octave_coreDefault value: 1.
     
sigterm_dumps_octave_coreDefault value: 1.
     
silent_functionsDefault value: 0.
     
split_long_rowsDefault value: 1.
     
struct_levels_to_printDefault value: 2.
     
suppress_verbose_help_messageDefault value: 1.