/usr/share/hyphy/ChartAddIns/Populate Cells is in hyphy-common 2.2.6+dfsg-3build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | if (NON_EMPTY_SELECTION)
{
	fprintf (stdout, "Formula to populate with (row_index and col_index will be replaced with actual cell row and column - both 0 based):");
	fscanf  (stdin,  "String", cell_populator);
	count = Columns (SELECTED_CHART_DATA);
	cell_populator = "new_cell_value:=" + cell_populator;
	ExecuteCommands (cell_populator);
	for (counter=0; counter < count; counter = counter+1)
	{
		row_index 					 = SELECTED_CHART_ROWS[counter];
		col_index 					 = SELECTED_CHART_COLS[counter];
		SELECTED_CHART_DATA[counter] = new_cell_value;
	}
	UPDATE_CELL_DATA = 1;
}
else
{
	NON_EMPTY_SELECTION = -1;
}
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