0.0:Prints all lines of a file that contain a string
0.1:Count the number of lines that contain string
0.2:Ignore case
0.3:Number the displayed lines, starting at 1
0.4:Print lines that do not contain the string
1.0:file
1.1:string
2.0:Cannot open file
2.1:No such file
2.2:Cannot change to directory
