#print In this directory there is a file "text"; whenever the letters "cat" begin a line, change them to "mouse"; but leave other instances of "cat" unaltered. Do this on each line. Then rewrite the file and type "ready". #create Ref mouse's paw alley cat mouse has nine lives let the cat out of the bag #create text cat's paw alley cat cat has nine lives let the cat out of the bag #user #cmp text Ref #log #next 39.1a 10