replacing the content of a text file

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H R
H R on 16 Aug 2018
Answered: Image Analyst on 17 Aug 2018
Hi all. I have a text file "A.txt". I have a string S='Hello World'.
How to delete from line 10 to the end of file in "A.txt" and replace those deleted contents by string S, and save the new file to "B.txt"?
  2 Comments
Paolo
Paolo on 16 Aug 2018
What's your OS? Can you show contents of "A.txt" ?
H R
H R on 16 Aug 2018
Windows 10. Please see the attached.

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Answers (1)

Image Analyst
Image Analyst on 17 Aug 2018
Try this:
S='Hello World';
% Open the input file for reading.
fullInputFileName = 'A.txt';
inputFileID = fopen(fullInputFileName, 'rt');
% Open the input file for reading.
fullOuputFileName = 'B.txt';
outputFileID = fopen(fullOuputFileName, 'wt');
% Transfer the first 9 lines.
for k = 1 : 9
% Read the line.
textLine = fgetl(inputFileID);
fprintf('Transferring line #%d: "%s"\n', k, textLine);
% Write the line.
textLine = fprintf(outputFileID, '%s\n', textLine);
end
% Write S to B.txt
textLine = fprintf(outputFileID, '%s\n', S);
% All done reading all lines, so close the file.
fclose(inputFileID);
fclose(outputFileID);
fprintf('\n--------------------------------\nHere is B.txt:\n');
type(fullOuputFileName);

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