.\" Hey, EMACS: -*- nroff -*- .\" First parameter, NAME, should be all caps .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection .\" other parameters are allowed: see man(7), man(1) .TH MOSH 1 "October 2012" .\" Please adjust this date whenever revising the manpage. .\" .\" Some roff macros, for reference: .\" .nh disable hyphenation .\" .hy enable hyphenation .\" .ad l left justify .\" .ad b justify to both left and right margins .\" .nf disable filling .\" .fi enable filling .\" .br insert line break .\" .sp insert n+1 empty lines .\" for manpage-specific macros, see man(7) .SH NAME mosh \- mobile shell with roaming and intelligent local echo .SH SYNOPSIS .B mosh .RI [ options ] [--] [user@]host [command...] .br .SH DESCRIPTION \fBmosh\fP (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 \fBssh\fP, \fBmosh\fP is more robust \(em its connections stay up across sleeps and changes in the client's IP address \(em and more responsive, because the protocol is tolerant of packet loss and the client can echo most keystrokes immediately, without waiting for a network round-trip. \fBmosh\fP uses \fBssh\fP to establish a connection to the remote host and authenticate with existing means (e.g., public-key authentication or a password). \fBmosh\fP executes the unprivileged \fBmosh-server\fP helper program on the server, then closes the SSH connection and starts the \fBmosh-client\fP, which establishes a long-lived datagram connection over UDP. To improve responsiveness, \fBmosh\fP runs a predictive model of the server's behavior in the background, trying to guess the effect of each keystroke on the screen. It makes predictions for normal typing, backspace, and the left- and right-arrow keys. When it is confident, \fBmosh\fP 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 \fBmosh\fP avoids echoing passwords or non-echoing editor commands. By default, \fBmosh\fP 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. \fBmosh\fP does not support X forwarding or the non-interactive uses of SSH, including port forwarding or sshfs. \fBmosh\fP works through typical client-side network address translators but requires UDP to pass between client and server. By default, \fBmosh\fP uses the ports between 60000 and 61000, but allows the user to request a particular UDP port instead. \fBmosh\fP 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. \fBmosh\fP will pass these client variables to the \fBmosh-server\fP on its command line, but in most cases they will not need to be used. \fBmosh-server\fP first attempts to use its own locale-related environment variables, which come from the system default configuration (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, \fBmosh-server\fP will apply the locale-related environment variables from the client and try again. .SH OPTIONS .TP .B \fIcommand\fP Command to run on remote host. By default, \fBmosh\fP executes a login shell. .TP .B \-\-client=\fIPATH\fP path to client helper on local machine (default: "mosh-client") .TP .B \-\-server=\fICOMMAND\fP 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. .TP .B \-\-ssh=\fICOMMAND\fP OpenSSH command to remotely execute mosh-server on remote machine (default: "ssh") An alternate ssh port can be specified with, \fIe.g.\fP, \-\-ssh="ssh \-p 2222". .TP .B \-\-predict=\fIWHEN\fP 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', \fBmosh\fP 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. .TP .B \-a Synonym for \-\-predict=always .TP .B \-n Synonym for \-\-predict=never .TP .B \-p \fIPORT\fP[:\fIPORT2\fP], \-\-port=\fIPORT\fP[:\fIPORT2\fP] Use a particular server-side UDP port or port range, for example, if this is the only port that is forwarded through a firewall to the server. Otherwise, \fBmosh\fP will choose a port between 60000 and 61000. .TP .B \-\-no\-init Do not send the \fBsmcup\fP initialization string and \fBrmcup\fP deinitialization string to the client's terminal. On many terminals this disables alternate screen mode. .SH ESCAPE SEQUENCES The escape sequence to shut down the connection is \fBCtrl-^ .\fP (typically typed with Ctrl-Shift-6, then a period). To send a literal Ctrl-^, type \fBCtrl-^ ^\fP. The sequence \fBCtrl-^ Ctrl-Z\fP suspends the client. .SH ENVIRONMENT VARIABLES .TP .B MOSH_PREDICTION_DISPLAY Controls local echo as described above. .TP .B MOSH_TITLE_NOPREFIX When set, inhibits prepending "[mosh]" to window title. .SH SEE ALSO .BR mosh-client (1), .BR mosh-server (1). Project home page: .I http://mosh.mit.edu .br .SH AUTHOR mosh was written by Keith Winstein . .SH BUGS Please report bugs to \fImosh-devel@mit.edu\fP. Users may also subscribe to the .nh .I mosh-users@mit.edu .hy mailing list, at .br .nh .I http://mailman.mit.edu/mailman/listinfo/mosh-users .hy .