dan:(git)2.6-mongo[v2.6]/$ ./mongofiles --help
Browse and modify a GridFS filesystem.

usage: mongofiles [options] command [gridfs filename]
command:
  one of (list|search|put|get)
  list - list all files.  'gridfs filename' is an optional prefix 
         which listed filenames must begin with.
  search - search all files. 'gridfs filename' is a substring 
           which listed filenames must contain.
  put - add a file with filename 'gridfs filename'
  get - get a file with filename 'gridfs filename'
  delete - delete all files with filename 'gridfs filename'
Options:
  --help                                produce help message
  -v [ --verbose ]                      be more verbose (include multiple times
                                        for more verbosity e.g. -vvvvv)
  --quiet                               silence all non error diagnostic 
                                        messages
  --version                             print the program's version and exit
  -h [ --host ] arg                     mongo host to connect to ( <set 
                                        name>/s1,s2 for sets)
  --port arg                            server port. Can also use --host 
                                        hostname:port
  --ipv6                                enable IPv6 support (disabled by 
                                        default)
  -u [ --username ] arg                 username
  -p [ --password ] arg                 password
  --authenticationDatabase arg          user source (defaults to dbname)
  --authenticationMechanism arg (=MONGODB-CR)
                                        authentication mechanism
  --gssapiServiceName arg (=mongodb)    Service name to use when authenticating
                                        using GSSAPI/Kerberos
  --gssapiHostName arg                  Remote host name to use for purpose of 
                                        GSSAPI/Kerberos authentication
  --dbpath arg                          directly access mongod database files 
                                        in the given path, instead of 
                                        connecting to a mongod  server - needs 
                                        to lock the data directory, so cannot 
                                        be used if a mongod is currently 
                                        accessing the same path
  --directoryperdb                      each db is in a separate directory 
                                        (relevant only if dbpath specified)
  --journal                             enable journaling (relevant only if 
                                        dbpath specified)
  -d [ --db ] arg                       database to use
  -c [ --collection ] arg               collection to use (some commands)
  -l [ --local ] arg                    local filename for put|get (default is 
                                        to use the same name as 'gridfs 
                                        filename')
  -t [ --type ] arg                     MIME type for put (default is to omit)
  -r [ --replace ]                      Remove other files with same name after
                                        PUT

dan:(git)mongo-tools[master]/$ mongofiles --help
Usage:
  mongofiles

general options:
      --help                     Print usage
      --version                  Print the version

verbosity options:
  -v, --verbose                  Set verbosity level
      --quiet                    Run in quiet mode, attempting to limit the amount of output

connection options:
  -h, --host=                    Specify a resolvable hostname to which to connect
      --port=                    Specify the tcp port on which the mongod is listening

authentication options:
  -u, --username=                Specify a user name for authentication
  -p, --password=                Specify a password for authentication
      --authenticationDatabase=  Specify the database that holds the user's credentials
      --authenticationMechanism= Specify the authentication mechanism to be used

storage options:
  -d, --db=                      database to use (test)
  -l, --local=                   local filename for put|get (default is to use the same name as 'gridfs filename')
  -t, --type=                    Content/MIME type for put (default is to omit)
  -r, --replace                  Remove other files with same name after put
      --prefix=                  GridFS prefix to use (fs)
      --writeConcern=            write concern options e.g. --writeConcern majority, --writeConcern '{w: 3, wtimeout: 500, fsync: true, j: true}' (majority)