How to copy a line from multiple files

Hello everyone. I have 360 files(.o) (from test(0).o-test(360).o), as figure. I want to copy a line (red framed) and put it in the new .txt file (ordinarily from 0 to 360 means in 361 lines)

Could you guys help me how to do that.

Thank a lot.

[KSSV]

Is the line number always same in all the files?

[viet le]

yes, they are totally the same

Answer 1

[Stephen23]

Assuming that that line is uniquely identified by the word 'total' and the line always has the same format, then you can use fileread and regexp in a loop. Here is an outline to get you started (untested):

 P = 'dirpath';
 S = dir(fullfile(P,'*.o'));
 %S = natsortfiles(S); % optional, see comment below
 fmt = '\n\s+total\s+(\S+)\s+(\S+)';
 for k = 1:numel(S)
     F = fullfile(P,S(k).name);
     str = fileread(F);
     C = regexp(str,fmt,'tokens','once');
     vec = str2double(C)
     ..
  end

If you want to process the filenames in the order of the numbers in their names, then you can use my FEX submission natsortfiles:

https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

[viet le]

Could you help me see where am I wrong, please?

https://uk.mathworks.com/matlabcentral/answers/331720-help-copy-a-line-from-a-file