ClusterSSH (cssh)

ClusterSSH is a tool to manage simultaneous interactive sessions across multiple SSH-accessible hosts. It opens one master terminal and many child terminal windows (or tabs), sending the same keystrokes to all clients while allowing isolated input per host. This is useful when orchestrating repetitive tasks—such as rolling updates or diagnosing distributed systems—without copying and pasting into each window. The interface supports splitting windows, delayed input modes, and host groupings to make clusters more manageable. It also includes features like per-host prompt prefixing or context awareness to avoid confusion in mixed environments. Because the architecture is simple and terminal-based, it works across diverse systems with minimal dependencies and remains popular among sysadmins wanting bulk control with tactile feedback.