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Copy a txt file and change a line by a other

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Lila wagou
Lila wagou 2016-3-23
评论： Walter Roberson 2016-3-24
Dear I have a problem to copy from a txt file to another one, and change a specific line i have found the copy file option
file_A = 'Ok_A.txt';
file_B = 'Ok_B.txt';
copyfile(file_A,file_B)
But i cannot go further

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Walter Roberson
Walter Roberson 2016-3-23
copyfile() is not appropriate for this. You need to fopen() one file for input and the other for output, and then copy the input to the output until you get to the line that is to be changed. Output the changed version of the line rather than the original version of the line. Then continue copying input to output until the end of file. Then fclose() the two files.
There is no way to make a change in the "middle" of a text file -- not unless the new text is exactly the same size as the original text. This is not a restriction imposed by MATLAB: it is a restriction on all file systems that have been implemented by vendors over the last 30-ish years.
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Lila wagou
Lila wagou 2016-3-24
Dear Walter, thank you lot. Please, a small change in the 4 line
fid_out = fopen('OK_B.txt', 'w');
Thank
Walter Roberson
Walter Roberson 2016-3-24
fid_in = fopen('Ok_A.txt', 'r');
fid_out = fopen('Ok_B.txt', 'w');
You can change the strings to whatever you need.

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