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https://github.com/innogames/polysh

Polysh, the remote shell multiplexer
https://github.com/innogames/polysh

bash multiplexer python3 shell terminal

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Polysh, the remote shell multiplexer

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README 

        
.. image:: https://travis-ci.org/innogames/polysh.svg?branch=master

    :target: https://travis-ci.org/innogames/polysh



Polysh

======



Polysh (formerly called Group Shell or gsh) is a remote shell multiplexer.

It lets you control many remote shells at once in a single shell.  Unlike

other commands dispatchers, it is interactive, so shells spawned on

the remote hosts are persistent.  It requires only a SSH server on the remote

hosts, or some other way to open a remote shell.



Python >= 3.5 is required.



Usage::



    polysh [OPTIONS]... HOSTS...



Prompt

------



The `polysh` prompt shows either `ready (X)>` or `waiting (X/Y)>`.

The `ready` prompt means that all enabled remote shells are ready to receive

commands and there are X such remote shells.  Failing that, the `waiting`

prompt is shown, meaning that X remote shells are not yet ready to receive

commands.  Either way, all the readline editing features like navigation in

the history, searching in the history, and completion are available.



Commands prefixed by an exclamation mark are executed locally.  Signals

`Ctrl-C` and `Ctrl-D` are forwarded to the remote shells.



The prompt supports completion by pressing the Tab key.  Completion results

are taken from the command line history, paths from the local filesystem and

commands from the user `$PATH`.



Hostnames with numbers can be generated by `polysh` using the ``

syntax.  The generated numbers will be zero padded according to the number

of zeroes in the `START` and `END` numbers.



Options

-------



`--version`

    Show program`s version number and exit



`-h, --help`

    Show the help message and exit



`--hosts-file=FILE`

    Read hostnames from given file, one per line



    Hostnames are given on

    the command line, but they can also be read from files.  The format is

    one hostname per line, `#` comments and blank lines are skipped.



`--command=CMD`

    Command to execute on the remote shells



    This starts `polysh` in

    non-interactive mode.  It will start the remote shells, send the command,

    print the output and exit when the command is completed on all remote

    shells.  This is the same as piping a command on the standard input.

    Exit codes from the remote shells will be aggregated (taking the max)

    to form `polysh`'s exit code.



`--ssh=SSH`

    Command to use for SSH



    By default, `exec ssh -oLogLevel=Quiet -t %(host)s %(port)s`.

    `polysh` spawns ssh for each connection which may spawn your default login

    shell on the remote, but another shell command can be specified here. For

    example, with `--ssh='usleep $((RANDOM*50)); exec ssh'` a delay will be

    introduced to avoid all hosts accessing a NFS server at the same time.  If

    the hostname should not be added at the end of the command, the macro

    `%(host)s` can be inserted where the hostname should be placed.  Also, make

    sure the command you use launches a `pty`, this may need the `-t` option for

    `ssh`.



`--user=USER`

    Remote user to log in as



    When specified, `polysh` will ssh to

    USER@HOST instead of simply HOST.



`--no-color`

    Disable colored hostnames, enabled by default



    When specified, `polysh` will not

    use tty colors for the hostname prefix.



`--password-file=FILE`

    Read a password from the specified file



    `-` is the tty.  This can be

    used when public key authentication is not available, either write

    the password in a file, or set FILE to `-` so that `polysh` will prompt

    for a password.



`--log-file=LOG_FILE`

    File to log each machine conversation



    If specified, `polysh`

    will log all executed commands and their output in the file.  The logging

    destination can be dynamically changed with the `:set_log` control

    command.



`--abort-errors`

    Abort if some shell fails to initialize



    By default, `polysh`

    just logs an error when it cannot successfully open a remote shell.

    With this option, it exits with a failure.



`--debug`

    Print debugging information



    Use this option to see exactly what is

    transferred between `polysh` and the remote shells.  This option can be

    dynamically toggled using the `:set_debug` command in the control shell.



Control Commands

----------------



Control commands are special purpose commands prefixed by a colon and

directed at `polysh` itself instead of the remote shells.  These commands are:



`:add NAMES...`

    Add one or many remote shells



`:chdir LOCAL_PATH`

    Change the current directory of `polysh` (not the remote shells)



`:disable [SHELLS...]`

    Disable sending commands to remote shells



    If the command would have

    no effect, it changes all other shells to the inverse enable value.

    That is, if you disable only already disabled shells, it will first

    enable all other shells.  The special characters `*`, `?`, and `[]` work

    as expected.



`:enable [SHELLS...]`

    Enable sending commands to remote shells.  If the command would have

    no effect, it changes all other shells to the inverse enable value.

    That is, if you enable only already enabled shells, it will first

    disable all other shells.  The special characters `*`, `?`, and `[]` work

    as expected.



`:export_vars`

    Export some environment variables on enabled remote shells



    `POLYSH_NR_SHELLS` is the total number of enabled shells.  `POLYSH_RANK`

    uniquely identifies each shell with a number between `0` and

    `POLYSH_NR_SHELLS - 1`.  `POLYSH_NAME` is the hostname as specified on

    the command line and `POLYSH_DISPLAY_NAME` the hostname as displayed

    by `:list` (most of the time the same as `POLYSH_NAME`).



`:hide_password`

    Do not echo the next typed line



    This is useful when entering password.

    If debugging or logging is enabled, it will be disabled to avoid

    displaying a password. Therefore, you will have to re-enable logging or

    debugging afterwards if need be.



`:list [SHELLS...]`

    List remote shells and their states



    The output consists of:

    `  : `.  The special

    characters `*`, `?`, and `[]` work as expected.



`:purge [SHELLS...]`

    Delete disabled remote shells



    This helps to have a shorter list.

    The special characters `*`, `?`, and `[]` work as expected.



`:quit`

    Quit `polysh`



`:reconnect [SHELLS...]`

    Try to reconnect to disconnected remote shells



    The special characters `*`, `?`, and `[]` work as expected.



`:rename [NEW_NAME]`

    Rename all enabled remote shells with the argument



    The argument will

    be shell expanded on the remote processes.  With no argument, the original

    hostname will be restored as the displayed name.



`:reset_prompt [SHELLS...]`

    Change the prompt to be recognized by `polysh`



    The special characters `*`, `?`, and `[]` work as expected.



`:send_ctrl LETTER [SHELLS...]`

    Send a control character to remote shells



    The first argument is the control character to send `c` or `d`.  Note that

    these control characters can also be sent simply by typing them.

    The remaining optional arguments are the destination shells.  The special

    characters `*`, `?`, and `[]` work as expected.



`:set_debug y|n [SHELLS...]`

    Enable or disable debugging output for remote shells



    The first

    argument is `y` to enable the debugging output, `n` to disable it.

    The remaining optional arguments are the selected shells. The special

    characters `*`, `?`, and `[]` work as expected.



`:set_log [LOCAL_PATH]`

    Duplicate every console I/O into the given local file



    If `LOCAL_PATH` is not given, restore the default behaviour of not logging.



`:show_read_buffer [SHELLS...]`

    Print the data read by remote shells



    The special characters `*`, `?`, and `[]` work as expected.



History

-------



The tool is authored by Guillaume Chazarain .  The first

version released in 2006.  It has been maintained by InnoGames GmbH

since 2018.