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+ttyd 1 "September 2016" ttyd "User Manual"
+==================================================
+
+# NAME
+ ttyd - Share your terminal over the web
+
+# SYNOPSIS
+ **ttyd** [options] \<command\> [\<arguments...\>]
+
+# DESCRIPTION
+ ttyd is a command-line tool for sharing terminal over the web that runs in *nix and windows systems, with the following features:
+
+ - Built on top of Libwebsockets with libuv for speed
+ - Fully-featured terminal based on Xterm.js with CJK (Chinese, Japanese, Korean) and IME support
+ - Graphical ZMODEM integration with lrzsz support
+ - Sixel image output support
+ - SSL support based on OpenSSL
+ - Run any custom command with options
+ - Basic authentication support and many other custom options
+ - Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt/LEDE, Windows
+
+# OPTIONS
+ -p, --port <port>
+ Port to listen (default: 7681, use `0` for random port)
+
+ -i, --interface <interface>
+ Network interface to bind (eg: eth0), or UNIX domain socket path (eg: /var/run/ttyd.sock)
+
+ -U, --socket-owner
+ User owner of the UNIX domain socket file, when enabled (eg: user:group)
+
+ -c, --credential USER[:PASSWORD]
+ Credential for Basic Authentication (format: username:password)
+
+ -H, --auth-header <name>
+ HTTP Header name for auth proxy, this will configure ttyd to let a HTTP reverse proxy handle authentication
+
+ -u, --uid <uid>
+ User id to run with
+
+ -g, --gid <gid>
+ Group id to run with
+
+ -s, --signal <signal string>
+ Signal to send to the command when exit it (default: 1, SIGHUP)
+
+ -w, --cwd <path>
+ Working directory to be set for the child program
+
+ -a, --url-arg
+ Allow client to send command line arguments in URL (eg: http://localhost:7681?arg=foo&arg=bar)
+
+ -W, --writable
+ Allow clients to write to the TTY (readonly by default)
+
+ -t, --client-option <key=value>
+ Send option to client (format: key=value), repeat to add more options, see **CLIENT OPTIONS** for details
+
+ -T, --terminal-type
+ Terminal type to report, default: xterm-256color
+
+ -O, --check-origin
+ Do not allow websocket connection from different origin
+
+ -m, --max-clients
+ Maximum clients to support (default: 0, no limit)
+
+ -o, --once
+ Accept only one client and exit on disconnection
+
+ -B, --browser
+ Open terminal with the default system browser
+
+ -I, --index <index file>
+ Custom index.html path
+
+ -b, --base-path
+ Expected base path for requests coming from a reverse proxy (eg: /mounted/here, max length: 128)
+
+ -P, --ping-interval
+ Websocket ping interval(sec) (default: 300)
+
+ -6, --ipv6
+ Enable IPv6 support
+
+ -S, --ssl
+ Enable SSL
+
+ -C, --ssl-cert <cert path>
+ SSL certificate file path
+
+ -K, --ssl-key <key path>
+ SSL key file path
+
+ -A, --ssl-ca <ca path>
+ SSL CA file path for client certificate verification
+
+ -d, --debug <level>
+ Set log level (default: 7)
+
+ -v, --version
+ Print the version and exit
+
+ -h, --help
+ Print this text and exit
+
+# CLIENT OPTIONS
+ttyd has a mechanism to pass server side command-line arguments to the browser page which is called **client options**:
+
+```bash
+-t, --client-option Send option to client (format: key=value), repeat to add more options
+```
+
+## Basic usage
+
+- `-t rendererType=canvas`: use the `canvas` renderer for xterm.js (default: `webgl`)
+- `-t disableLeaveAlert=true`: disable the leave page alert
+- `-t disableResizeOverlay=true`: disable the terminal resize overlay
+- `-t disableReconnect=true`: prevent the terminal from reconnecting on connection error/close
+- `-t enableZmodem=true`: enable [ZMODEM](https://en.wikipedia.org/wiki/ZMODEM) / [lrzsz](https://ohse.de/uwe/software/lrzsz.html) file transfer support
+- `-t enableTrzsz=true`: enable [trzsz](https://trzsz.github.io) file transfer support
+- `-t enableSixel=true`: enable [Sixel](https://en.wikipedia.org/wiki/Sixel) image output support ([Usage](https://saitoha.github.io/libsixel/))
+- `-t titleFixed=hello`: set a fixed title for the browser window
+- `-t fontSize=20`: change the font size of the terminal
+
+## Advanced usage
+
+You can use the client option to change all the settings of xterm defined in [ITerminalOptions](https://xtermjs.org/docs/api/terminal/interfaces/iterminaloptions/), examples:
+
+- `-t cursorStyle=bar`: set cursor style to `bar`
+- `-t lineHeight=1.5`: set line-height to `1.5`
+- `-t 'theme={"background": "green"}'`: set background color to `green`
+
+to try the example options above, run:
+
+```bash
+ttyd -t cursorStyle=bar -t lineHeight=1.5 -t 'theme={"background": "green"}' bash
+```
+
+# EXAMPLES
+ ttyd starts web server at port 7681 by default, you can use the -p option to change it, the command will be started with arguments as options. For example, run:
+
+```
+ttyd -p 8080 bash -x
+```
+
+ Then open http://localhost:8080 with a browser, you will get a bash shell with debug mode enabled. More examples:
+
+ - If you want to login with your system accounts on the web browser, run `ttyd login`.
+ - You can even run a none shell command like vim, try: `ttyd vim`, the web browser will show you a vim editor.
+ - Sharing single process with multiple clients: `ttyd tmux new -A -s ttyd vim`, run `tmux new -A -s ttyd` to connect to the tmux session from terminal.
+
+# SSL how-to
+ Generate SSL CA and self signed server/client certificates:
+
+```
+# CA certificate (FQDN must be different from server/client)
+openssl genrsa -out ca.key 2048
+openssl req -new -x509 -days 365 -key ca.key -subj "/C=CN/ST=GD/L=SZ/O=Acme, Inc./CN=Acme Root CA" -out ca.crt
+
+# server certificate (for multiple domains, change subjectAltName to: DNS:example.com,DNS:www.example.com)
+openssl req -newkey rsa:2048 -nodes -keyout server.key -subj "/C=CN/ST=GD/L=SZ/O=Acme, Inc./CN=localhost" -out server.csr
+openssl x509 -sha256 -req -extfile <(printf "subjectAltName=DNS:localhost") -days 365 -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt
+
+# client certificate (the p12/pem format may be useful for some clients)
+openssl req -newkey rsa:2048 -nodes -keyout client.key -subj "/C=CN/ST=GD/L=SZ/O=Acme, Inc./CN=client" -out client.csr
+openssl x509 -req -days 365 -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt
+openssl pkcs12 -export -clcerts -in client.crt -inkey client.key -out client.p12
+openssl pkcs12 -in client.p12 -out client.pem -clcerts
+```
+
+ Then start ttyd:
+
+```
+ttyd --ssl --ssl-cert server.crt --ssl-key server.key --ssl-ca ca.crt bash
+```
+
+ You may want to test the client certificate verification with *curl*(1):
+
+```
+curl --insecure --cert client.p12[:password] -v https://localhost:7681
+```
+
+ If you don't want to enable client certificate verification, remove the `--ssl-ca` option.
+
+# Docker and ttyd
+ Docker containers are jailed environments which are more secure, this is useful for protecting the host system, you may use ttyd with docker like this:
+
+ - Sharing single docker container with multiple clients: docker run -it --rm -p 7681:7681 tsl0922/ttyd.
+ - Creating new docker container for each client: ttyd docker run -it --rm ubuntu.
+
+# Nginx reverse proxy
+
+Sample config to proxy ttyd under the `/ttyd` path:
+
+```nginx
+location ~ ^/ttyd(.*)$ {
+ proxy_http_version 1.1;
+ proxy_set_header Host $host;
+ proxy_set_header X-Forwarded-Proto $scheme;
+ proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+ proxy_set_header Upgrade $http_upgrade;
+ proxy_set_header Connection "upgrade";
+ proxy_pass http://127.0.0.1:7681/$1;
+}
+```
+
+# AUTHOR
+ Shuanglei Tao \<tsl0922@gmail.com\> Visit https://github.com/tsl0922/ttyd to get more information and report bugs.