/usr/share/highlight/langDefs/octave.lang is in highlight-common 3.41-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"debug_symtab_lookups", "output_max_field_width", "warn_fortran_indexing",
"IMAGEPATH", "default_save_formatoutput_precision", "warn_function_name_clash",
"INFO_FILE",
"echo_executing_commandspage_output_immediatelywarn_future_time_stamp",
"INFO_PROGRAM", "fixed_point_format", "page_screen_output", "warn_imag_to_real",
"LOADPATH", "gnuplot_binary", "print_answer_id_name",
"warn_matlab_incompatible", "MAKEINFO_PROGRAM", "gnuplot_command_axes",
"print_empty_dimensions", "warn_missing_semicolon", "PAGER",
"gnuplot_command_end", "print_rhs_assign_val", "warn_neg_dim_as_zero", "PS1",
"gnuplot_command_plot", "save_header_format_stringwarn_num_to_str", "PS2",
"gnuplot_command_replot", "save_precision", "warn_precedence_change", "PS4",
"gnuplot_command_splot", "saving_history", "warn_reload_forces_clear",
"__kluge_procbuf_delay__", "gnuplot_command_title", "sighup_dumps_octave_core",
"warn_resize_on_range_error", "__nargin__",
"gnuplot_command_usingsigterm_dumps_octave_corewarn_separator_insert",
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{ Id=3,
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"sinh", "toupper", "asin", "cos", "fix", "isalnum", "isgraph", "ispunct",
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