# csshX > Cluster SSH tool for macOS. > More information: . - Connect to multiple hosts: `csshX {{hostname1}} {{hostname2}}` - Connect to multiple hosts with a given SSH key: `csshX {{user@hostname1}} {{user@hostname2}} --ssh_args "-i {{path/to/ssh_key.pem}}"` - Connect to a pre-defined cluster from `/etc/clusters`: `csshX cluster1`