4. Find what -c, -r, and -b flags do in grep by reading the manual.

• -c stands for “count”. It will limit the output of grep to just the number of matches, not the matches themselves.
• -r stands for “recursive”, and it will tell grep that it should look through the subdirectories of the requested path.
• -b stands for “byte-offset” and it will tell you the line number, and position of grep’s matches.