How to copy a line from multiple files

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viet le
viet le 2017-3-23
编辑： Stephen23 2021-4-26
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.

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Stephen23
Stephen23 2017-3-23
编辑：Stephen23 2021-4-26
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
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viet le
viet le 2017-3-24
编辑：viet le 2017-3-24
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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