grep.sheet

  Overview
  ========
  grep searches for lines matching a pattern.
  
  $ grep [OPTION]... PATTERN [FILE] ...
  
  PATTERN can be a normal string or a regular expression. For more on regular expressions see:
  $ cheat regexp
  
  Get full help:
  $ grep --help
  
  Basic Usage
  ===========
  $ grep index *.rb
  admin_controller.rb:  def index
  store_controller.rb:  def index
  store_controller.rb:    redirect_to_index 'Invalid product'
  store_controller.rb:      redirect_to_index "Your cart is currently empty."
  
  
  Useful Options
  ==============
  -h:   suppress file names in output
  -w:   restrict search to whole words only
  -c:   displays count of matching lines in each file, not the lines themselves
        (note this is not the same as $ grep index *.rb | wc -l)
  -i:   ignore case
  -l:   list only file names containing matching lines
  -n:   precede each line with the line number where it was found
  -v:   display all lines NOT matching pattern