MOSH(1) 						      General Commands Manual							   MOSH(1)

NAME

       mosh - mobile shell with roaming and intelligent local echo

SYNOPSIS

       mosh [options] [--] [user@]host [command...]

DESCRIPTION

       mosh  (mobile  shell)  is  a  remote terminal application that supports intermittent connectivity, allows roaming, and provides speculative
       local echo and line editing of user keystrokes.

       Compared with ssh, mosh is more robust -- its connections stay up across sleeps and changes in the client's IP address -- and more  respon-
       sive,  because  the  protocol is tolerant of packet loss and the client can echo most keystrokes immediately, without waiting for a network
       round-trip.

       mosh uses ssh to establish a connection to the remote host and authenticate with existing means (e.g., public-key authentication or a pass-
       word).  mosh executes the unprivileged mosh-server helper program on the server, then closes the SSH connection and starts the mosh-client,
       which establishes a long-lived datagram connection over UDP.

       To improve responsiveness, mosh runs a predictive model of the server's behavior in the background, trying to guess the effect of each key-
       stroke  on  the	screen.  It makes predictions for normal typing, backspace, and the left- and right-arrow keys. When it is confident, mosh
       displays the predictions without waiting for the server. The predictive model must prove itself anew on each row of the terminal and  after
       each control character, so mosh avoids echoing passwords or non-echoing editor commands.

       By  default,  mosh shows its predictions only on high-latency connections and to smooth out network glitches. (On longer-latency links, the
       predicted cells are underlined until confirmed by the server.) Occasional echo mistakes are corrected within a network  round-trip  and	do
       not cause lasting effect.

       mosh  does  not	support  X  forwarding	or the non-interactive uses of SSH, including port forwarding or sshfs. mosh works through typical
       client-side network address translators but requires UDP to pass between client and server. By default, mosh uses the ports  between  60000
       and 61000, but allows the user to request a particular UDP port instead.

       mosh  will  do  its  best to arrange a UTF-8 character set locale on the client and server. The client must have locale-related environment
       variables that specify UTF-8. mosh will pass these client variables to the mosh-server on its command line, but in most cases they will not
       need to be used. mosh-server first attempts to use its own locale-related environment variables, which come from the system default config-
       uration (sometimes /etc/default/locale) or from having been passed over the SSH connection. But if these variables don't call for  the  use
       of UTF-8, mosh-server will apply the locale-related environment variables from the client and try again.

OPTIONS

       command
	      Command to run on remote host. By default, mosh executes a login shell.

       --client=PATH
	      path to client helper on local machine (default: "mosh-client")

       --server=COMMAND
	      command to run server helper on remote machine (default: "mosh-server")

	      The server helper is unprivileged and can be installed in the user's home directory.

       --ssh=COMMAND
	      OpenSSH command to remotely execute mosh-server on remote machine (default: "ssh")

	      An alternate ssh port can be specified with, e.g., --ssh="ssh -p 2222".

       --predict=WHEN
	      Controls	use  of  speculative  local  echo. WHEN defaults to `adaptive' (show predictions on slower links and to smooth out network
	      glitches) and can also be `always` or `never'.

	      The MOSH_PREDICTION_DISPLAY environment variable controls this setting permanently and can adopt the same three values.

	      Even on `always', mosh will only show predictions when it is confident. This generally means a previous prediction on the  same  row
	      of the terminal has been confirmed by the server, without any intervening control character keystrokes.

       -a     Synonym for --predict=always

       -n     Synonym for --predict=never

       -p NUM, --port=NUM
	      Use  a  particular  server-side  UDP port, for example, if this is the only port that is forwarded through a firewall to the server.
	      Otherwise, mosh will choose a port between 60000 and 61000.

ESCAPE SEQUENCE

       The escape sequence to shut down the connection is Ctrl-^ .  (typically typed with Ctrl-Shift-6, then a period). To send a literal  Ctrl-^,
       type Ctrl-^ ^.

ENVIRONMENT VARIABLES

       MOSH_PREDICTION_DISPLAY
	      Controls local echo as described above.

       MOSH_TITLE_NOPREFIX
	      When set, inhibits prepending "[mosh]" to window title.

SEE ALSO

       mosh-client(1), mosh-server(1).

       Project home page: http://mosh.mit.edu

AUTHOR

       mosh was written by Keith Winstein <mosh-devel@mit.edu>.

BUGS

       Please report bugs to mosh-devel@mit.edu. Users may also subscribe to the mosh-users@mit.edu mailing list, at
       http://mailman.mit.edu/mailman/listinfo/mosh-users

								   February 2012							   MOSH(1)