windows 에서 grep 과 비슷한 역활의 명령

grep를 설치할 수 없는 사정이 있다면,
"FINDSTR"을 사용하세요...

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]
        [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
  /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

For full information on FINDSTR regular expressions refer to the online Command
Reference.