2;04-Mär-2013;00:00:00;152
2;04-Mär-2013;00:10:00;150.13187
2;04-Mär-2013;00:20:00;149.29033
2;04-Mär-2013;00:30:00;149.31183

clc
clear all
filelist=dir('*.csv');
filenum = length(filelist);

for i=1:filenum
    [~, name, ~] = fileparts(filelist(i).name);
    fprintf('step: %dn', i);
    fid1 = fopen(filelist(i).name,'r');
    fprintf('%sn', filelist(i).name);
    fid2 = fopen([name '.csv'],'w');
    fwrite(fid2,strrep(fread(fid1,'*char')','.',','));

    fclose(fid1);
    fclose(fid2);

end