Copyfile without overwriting

Hello!

How can I copy the content of a *.m file in another. I used copyfile('1.m','2.m') but with this command the content of 2.m will be overwriten by the content of 1.m.

Ex: 1.m content: test1; 2.m content: test 2. I am expecting to get after using copyfile the content of 2.m like: test 2, test1.

I also used the next lines but it is not looking ok.. % fid = fopen('first.m'); % F= fread(fid, '*char')'; % fclose(fid);

Thanks!

Answer 1

[Honglei Chen]

I don't think you can do that with copyfile. You can do it with fopen, but you need to open it with option 'a', and then append the content you want.

doc fopen

Here is an example

fid1 = fopen('1.m','r');
fid2 = fopen('2.m','a');
while 1
  tline = fgetl(fid1);
  if ~ischar(tline), break, end
  fprintf(fid2,'%s\n',tline);
end
fclose(fid1);
fclose(fid2);

Answer 2

[Sean de Wolski]

You could use fwrite, or fprintf to write to the end of the file, fgetl would also be your friend.

[Diana Acreala]

In sure that 'fgetl' helps me..but I don't understand how it works..

[Honglei Chen]

To use all of these you need to use fopen first to open the file. You can open your 1.m in 'r' mode and 2.m in 'a' mode. You can then get each line from 1.m using fgetl and write them to 2.m using fwrite or fprintf.

[Diana Acreala]

%script

FileDir = mfilename('fullpath');

all_files=what;

only_m_files=all_files.m;

%type the name of the needed file

filename = input('Enter name of file: ', 's');

for k=1:length(only_m_files)

if strcmp(only_m_files{k,1},'script.m')==1

elseif strcmp(only_m_files{k,1},filename)==1

else

fid = fopen(only_m_files{k,1});

F{k,1}= fread(fid, '*char')';

fclose(fid);

end

end

% Create the file

fid = fopen(filename, 'w');

for k=1:length(F)

fwrite(fid, F{k,1});

end

fclose(fid);

[Diana Acreala]

With this looks that is working, but.. the problem is with the 'fgetl' command.. where in this code shoul I use it?

[Honglei Chen]

I added an example in my answer above

[Diana Acreala]

Great! I adapted with your example and it's working! Thanks a lot!