How to copy a line from multiple files

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viet le
viet le il 23 Mar 2017
Modificato: Stephen23 il 26 Apr 2021
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.
  2 Commenti
KSSV
KSSV il 23 Mar 2017
Is the line number always same in all the files?
viet le
viet le il 23 Mar 2017
yes, they are totally the same

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Stephen23
Stephen23 il 23 Mar 2017
Modificato: Stephen23 il 26 Apr 2021
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:
  1 Commento
viet le
viet le il 24 Mar 2017
Modificato: viet le il 24 Mar 2017
Could you help me see where am I wrong, please?
https://uk.mathworks.com/matlabcentral/answers/331720-help-copy-a-line-from-a-file

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