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Octave uses the values of the following environment variables to set the default values for the corresponding built-in or internal variables. In addition, the values from the environment may be overridden by command-line arguments. See Command Line Options.
EDITORBuilt-in variable: EDITOR.
     
OCTAVE_EXEC_PATHBuilt-in variable: EXEC_PATH. 
Command-line argument: --exec-path.
     
OCTAVE_PATHInternal variable changed by function path. 
Command-line argument: --path.
     
OCTAVE_INFO_FILEInternal variable changed by function info_file. 
Command-line argument: --info-file.
     
OCTAVE_INFO_PROGRAMInternal variable changed by function info_program. 
Command-line argument: --info-program.
     
OCTAVE_HISTSIZEBuilt-in variable: history_size.
     
OCTAVE_HISTFILEBuilt-in variable: history_file.