Appear is a tool for revealing a given process in your terminal. Given a process ID, `appear` finds the terminal emulator view (be it a window, tab, or pane) containing that process and shows it to you. Appear understands terminal multiplexers like `tmux`, so if your target process is in a multiplexer session, `appear` will reveal a client connected to that session, or start one if needed. This project intends to support all POSIX operating systems eventually, but currently only supports macOS.