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README.md

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+Mosh: the mobile shell
+======================
+
+Mosh is a remote terminal application that supports intermittent
+connectivity, allows roaming, and provides speculative local echo
+and line editing of user keystrokes.
+
+It aims to support the typical interactive uses of SSH, plus:
+
+   * Mosh keeps the session alive if the client goes to sleep and
+     wakes up later, or temporarily loses its Internet connection.
+
+   * Mosh allows the client and server to "roam" and change IP
+     addresses, while keeping the connection alive. Unlike SSH, Mosh
+     can be used while switching between Wi-Fi networks or from Wi-Fi
+     to cellular data to wired Ethernet.
+
+   * The Mosh client runs a predictive model of the server's behavior
+     in the background and tries to guess intelligently how each
+     keystroke will affect the screen state. When it is confident in
+     its predictions, it will show them to the user while waiting for
+     confirmation from the server. Most typing and uses of the left-
+     and right-arrow keys can be echoed immediately.
+
+     As a result, Mosh is usable on high-latency links, e.g. on a
+     cellular data connection or spotty Wi-Fi. In distinction from
+     previous attempts at local echo modes in other protocols, Mosh
+     works properly with full-screen applications such as emacs, vi,
+     alpine, and irssi, and automatically recovers from occasional
+     prediction errors within an RTT. On high-latency links, Mosh
+     underlines its predictions while they are outstanding and removes
+     the underline when they are confirmed by the server.
+
+Mosh does not support X forwarding or the non-interactive uses of SSH,
+including port forwarding.
+
+
+Other features
+--------------
+
+   * Mosh adjusts its frame rate so as not to fill up network queues
+     on slow links, so "Control-C" always works within an RTT to halt
+     a runaway process.
+
+   * Mosh warns the user when it has not heard from the server
+     in a while.
+
+   * Mosh supports lossy links that lose a significant fraction
+     of their packets.
+
+   * Mosh handles some Unicode edge cases better than SSH and existing
+     terminal emulators by themselves, but requires a UTF-8
+     environment to run.
+
+   * Mosh leverages SSH to set up the connection and authenticate
+     users. Mosh does not contain any privileged (root) code.
+
+
+Usage
+-----
+
+  The `mosh-client` binary must be installed on the user's machine, and
+  the `mosh-server` binary on the remote host.
+
+  The user runs:
+
+    $ mosh [user@]host
+
+  If the `mosh-client` or `mosh-server` binaries are installed outside the
+  user's PATH, mosh accepts the arguments `--client=PATH` and
+  `--server=PATH` to select alternate locations.
+
+
+How it works
+------------
+
+  The mosh program will SSH to `user@host` to establish the connection.
+  SSH may prompt the user for a password or use public-key
+  authentication to log in.
+
+  From this point, mosh runs the `mosh-server` process (as the user)
+  on the server machine. The server process listens on a high UDP port
+  and sends its port number and an AES-128 secret key back to the
+  client over SSH. The SSH connection is then shut down and the
+  terminal session begins over UDP.
+
+  If the client changes IP addresses, the server will begin sending
+  to the client on the new IP address within a few seconds.
+
+  To function, Mosh requires high-port UDP datagrams to be passed
+  between client and server. Sites that have these ports firewalled
+  would not be able to use Mosh.
+
+
+More info
+---------
+
+  * Mosh Web site:
+
+    <http://mosh.mit.edu>
+
+  * `mosh-users@mit.edu` mailing list:
+
+    <http://mailman.mit.edu/mailman/listinfo/mosh-users>