how to compare two files line by line?

I want to compare two files line by line and count how many lines they have in common , I tried the code below , but it doesn't work , somehow MATLAB stops working , ">>" just disappear

f = fopen('nv.txt','at');
fid = fopen('test.txt');
k = 0;
while ~feof(fid)
  s1 = fgetl(fid);
    if ~isempty(s1)
       while ~feof(f)
          s2 = fgetl(f);
             if ~isempty(s2)
                    if(strcmp(s1,s2))
                         k = k+1;
                    end
             end
       end 
    end
end 
fclose(fid);
fclose(f);

disp(k);

[Image Analyst]

If the second line is missing in one of the files, (and the rest of the lines are just moved up one) then do you say that from line 2 on they are all different?

What if the lines are all there but in some different order?

Answer 1

[MHN]

f = fopen('nv.txt');
fid = fopen('test.txt');
k = 0;
while ~feof(fid)
  s1 = fgetl(fid);
  frewind(f) % start from the first line of the second file
    if ~isempty(s1)
       while ~feof(f)
          s2 = fgetl(f);
             if ~isempty(s2)
                    if(strcmp(s1,s2))
                         k = k+1;
                    end
             end
       end 
    end
end 
fclose(fid);
fclose(f);

disp(k);

[Zineb EL MORCHID]

Thank you,it works now. but I noticed that it compares all the lines except the first one of the second file

[MHN]

Please use the "accepted answer" button. Are you sure? I run the program line by line and it compares every lines include the first one.

[Zineb EL MORCHID]

Yes Thank you, it works , I find out that one of the lines starts with space.

Answer 2

[Image Analyst]

Did you try the Compare tool on the Editor tool strip?

[Zineb EL MORCHID]

Not really,I actually want the code to use it as a function in my program. Thank you

[Adam Danz]

This is best approach.

Also see visdiff.

Answer 3

[r r]

I have two files with similar data and I want to extract them into a file, and I also want to print the same line for the same data in the two files

Please help me

F1 = fopen('E.txt');

T1 = textscan(F1,'%s', 'delimiter', '\n');

fclose(F1);

F2 = fopen('G.txt');

tt2 = textscan(F2,'%s', 'delimiter', '\n');

fclose(F2);

T1s = char(T1{:});

T2s = char(T2{:});

[C,ix,ic] = intersect(T1s,T2s,'rows')

%%%%%%%%%%%%%%%%%%out Fiel :::

dlmwrite('R.txt',C,'%.6f');