signal-cli

signal-cli is a command-line interface for the Signal messenger that allows users to register, verify, send, and receive messages. It is primarily designed for server-side operations to notify administrators of critical events, featuring a daemon mode with a JSON-RPC and D-BUS interface for integration. Notably, signal-cli requires regular updates to maintain compatibility with Signal server changes, and it can be built from source or installed using provided binaries for various operating systems.