$ mongooplog --help
Pull and replay a remote MongoDB oplog.

options:
  --help                          produce help message
  -v [ --verbose ]                be more verbose (include multiple times for 
                                  more verbosity e.g. -vvvvv)
  --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
  --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                if dbpath specified, each db is in a separate
                                  directory
  --journal                       enable journaling
  -d [ --db ] arg                 database to use
  -c [ --collection ] arg         collection to use (some commands)
  -f [ --fields ] arg             comma separated list of field names e.g. -f 
                                  name,age
  --fieldFile arg                 file with fields names - 1 per line
  -s [ --seconds ] arg            seconds to go back default:86400
  --from arg                      host to pull from
  --oplogns arg (=local.oplog.rs) ns to pull from