grep in windows

findstr command is the equivalent of grep in unix

c:\> FindStr /?

Searches for strings in files.

FINDSTR [/B] [/E] [/L] [/R] [/S] [/I] [/X] [/V] [/N] [/M] [/O] [/P] [/F:file]
        [/C:string] [/G:file] [/D:dir list] [/A:color attributes] [/OFF[LINE]]
        strings [[drive:][path]filename[ ...]]

  /B         Matches pattern if at the beginning of a line.
  /E         Matches pattern if at the end of a line.
  /L         Uses search strings literally.
  /R         Uses search strings as regular expressions.
  /S         Searches for matching files in the current directory and all
             subdirectories.
  /I         Specifies that the search is not to be case-sensitive.
  /X         Prints lines that match exactly.
  /V         Prints only lines that do not contain a match.
  /N         Prints the line number before each line that matches.
  /M         Prints only the filename if a file contains a match.
  /O         Prints character offset before each matching line.
  /P         Skip files with non-printable characters.
  /OFF[LINE] Do not skip files with offline attribute set.
  /A:attr    Specifies color attribute with two hex digits. See "color /?"
  /F:file    Reads file list from the specified file(/ stands for console).
  /C:string  Uses specified string as a literal search string.
  /G:file    Gets search strings from the specified file(/ stands for console).
  /D:dir     Search a semicolon delimited list of directories
  strings    Text to be searched for.
  [drive:][path]filename              Specifies a file or files to search. Use spaces to separate multiple search strings unless the argument is prefixed with /C.  For example, 'FINDSTR "hello there" x.y' searches for "hello" or "there" in file x.y.  'FINDSTR /C:"hello there" x.y' searches for "hello there" in file x.y. Regular expression quick reference:
   .        Wildcard: any character
   *        Repeat: zero or more occurances of previous character or class
   ^        Line position: beginning of line
   $        Line position: end of line 
   [class]  Character class: any one character in set
   [^class] Inverse class: any one character not in set   
   [x-y]     Range: any characters within the specified range   
   \x       Escape: literal use of metacharacter x
   \<xyz    Word position: beginning of word
   xyz\>    Word position: end of word 

grepwin for graphical interface

cygwin