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March 2018


TermySequence terminal multiplexer server


termy-connect - Establish connection between TermySequence servers


termy-connect [options] [--] command [arg...]


termy-connect is used to establish a connection between a local instance of termy-server(1) and an instance running on a different host, as a different user, or in a container. termy-connect runs a helper program, specified by command and args, which must itself execute an instance of termy-server(1) on the desired remote system and make it accessible over standard input and standard output. After the handshake from the remote server is received, termy-connect connects to the local termy-server(1) instance, sets up the link between the two servers, and exits. File descriptor passing is used to hand the helper process over to the local server, making it unnecessary for termy-connect to forward traffic.
Separate convenience scripts are provided for commonly used helper programs: termy-ssh(1), termy-sudo(1), and termy-su(1). However, any program that can be used to execute an instance of termy-server(1) in a remote environment can be used with termy-connect. The convenience scripts are simple wrappers for termy-connect and are documented further in their own man pages.
Until termy-connect sees a valid TermySequence protocol handshake, any output produced by the helper program is relayed to standard output, and standard input is relayed to the helper program (with terminal echo disabled). This allows passwords, pass phrases, and other input to be collected from the user to establish the connection. Once the connection is established and termy-connect has exited, the helper program will be detached from the terminal and running in the background.
However, a side effect of this feature is that any diagnostic messages printed by the helper program once the connection is established will interrupt the protocol stream. Furthermore, the default "raw" encoding of the TermySequence protocol cannot be used if the helper program interferes with the data stream, such as by providing escape sequences to interrupt the connection. Helper programs should be run with appropriate arguments to minimize the number of messages printed and to (ideally) make the data stream 8-bit safe. termy-connect provides options to change the variant of the TermySequence protocol used as necessary to ensure a clean connection. See OPTIONS below for further details.


-p,--pty Run command in a pseudoterminal. Use this option if the helper program expects standard input to be connected to a terminal.
-P,--nopty Do not run command in a pseudoterminal (a socket or pipe is used). This is the default.
-r,--raw Use the 8-bit "raw" encoding of the TermySequence protocol. This encoding offers the best performance, but cannot be used if the data stream is not 8-bit safe. This is the default.
-R,--noraw Use the 7-bit "term" encoding of the TermySequence protocol. This encoding uses Base64 encoded terminal escape sequences, and will function in non-8-bit-safe data streams. It is also somewhat robust against occasional diagnostic messages being printed into the data stream.
-k,--keepalive n Enable keep-alive probes with a timeout of n seconds on the connection. A timeout of 0 disables keep-alive probes. The default timeout is 25 seconds and the minimum (nonzero) timeout is 5 seconds.
-d,--dir dir Start command in directory dir. Relative paths are interpreted relative to $HOME. By default $HOME is used.
-0,--arg0 arg Use arg as the first argument vector element when running command.
-n,--noosc Do not issue TermySequence escape sequences if standard input is a tty. Use when running in a terminal emulator other than termy-server(1).
-t,--runtime dir Look for the per-user local socket in runtime directory dir.
--help Print basic help
--version Print version information
--man Attempt to show this man page
--about Print license information and disclaimer of warranty


termy-connect is an alias for termy-server; both functions are implemented by the same binary.


termy-server(1), termy-ssh(1), termy-su(1), termy-sudo(1)
TermySequence -
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