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Octave uses the values of the following environment variables to set the default values for the corresponding built-in 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_PATHBuilt-in variable: LOADPATH.
Command-line argument: --path.
OCTAVE_INFO_FILEBuilt-in variable: INFO_FILE.
Command-line argument: --info-file.
OCTAVE_INFO_PROGRAMBuilt-in variable: INFO_PROGRAM.
Command-line argument: --info-program.
OCTAVE_HISTSIZEBuilt-in variable: history_size.
OCTAVE_HISTFILEBuilt-in variable: history_file.