clc; clear all ;
file = 'B00001.txt' ;
fid = fopen(file,'r') ;
S=textscan(fid,'%s','delimiter','\n');
fclose(fid) ;
S = S{1} ;
All the file contents will be saved in cell S. You can do what ever you want from S.
Note that there are many other ways to read a file.