Try something like this
files = dir('**/report-file-1.out'); % <--- enter current name
new_name = 'b1-moment-z-rfile.out'; % <- enter new name
for i=1:numel(files)
current_path = fullfile(files(i).folder, files(i).name);
new_path = fullfile(files(i).folder, new_name);
movefile(current_path, new_path);
end
