Editing a txt file and replace a specifics lines

Dear all, my question is about the edition of an txt file and the replacement of the 4 and the 5 line and keep the above ones and the after ones: txtfile = ZZZ.txt

Not change
Not change
Not change
TO change
TO change

Any suggestions please.

[Azzi Abdelmalek]

How you replace these lines?

[judy abbott]

i look to replace the wholes lines (the 4 and the 5) by other lines, i think to do an counter (while .. do)

Answer 1

[Azzi Abdelmalek]

Read your text file

fid=fopen('ZZZ.txt')
s=textscan(fid,'%s')
fclose(fid)
out=[s{:}]

Then replace whatever you want

[judy abbott]

@ Azzi, it work for edition, how i keep the above lines and the next one and to save them in the same (ZZZ.txt) file

[Azzi Abdelmalek]

%lines that replace the two lines of out
line1='abc'
line2='efg'
out(4:5)={line1;line2}
fid=fopen('fic1.txt','w')
for k=1:numel(out)
 fprintf(fid,'%s\n',out{k})
end
fclose(fid)

[judy abbott]

Ok it's done