Grep

• Grep's default: search inside each line
• Common grap flags

  Idea	Flag	Meaning
  eXact	-x	Recognize entire line
  Count	-c	Count the number of matches
  Number	-n	Give line numbers 1...
  reVerse	-v	Give us the lines that don't match
  Whole Word	-w	The pattern must be surrounded by space
  List	-l	List file names that contained a match

  e.g. grep -x b[1-5]c\* myfile.txt

• [:cntrl:] - control characters like \n and ^L and ^M (the line breaks). See "man grep" for details.