pssh

pssh is a command line tool that stands for "Parallel SSH" and is used for executing commands on multiple remote servers simultaneously. It is designed to make remote administration tasks easier and more efficient, especially for managing a large number of servers. With pssh, you can specify a list of target hosts and execute a command or script on all those hosts at once. The tool utilizes parallel processing, allowing it to execute commands simultaneously on multiple servers, thus reducing execution time. It supports a range of authentication methods, including password-based authentication, public key authentication, and Kerberos. Pssh also provides options for controlling the number of simultaneous connections, reducing the load on the local machine and remote servers. It offers various output formats, including raw, ordered, and grouped, enabling flexible and readable output. Pssh provides a set of utilities like pscp (for copying files), prsync (for synchronizing files), and pslurp (for uploading/downloading files). It supports executing commands interactively, as well as non-interactively by reading commands from a file. Overall, pssh is a powerful and versatile tool for efficient remote server administration, enabling administrators to save time and effort in managing multiple servers simultaneously.