How to copy a line from multiple files
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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
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:
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