pattern            12 user/grep.c    grep(char *pattern, int fd)
pattern            24 user/grep.c          if(match(pattern, p)){
pattern            41 user/grep.c      char *pattern;
pattern            47 user/grep.c      pattern = argv[1];
pattern            50 user/grep.c        grep(pattern, 0);
pattern            59 user/grep.c        grep(pattern, fd);