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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 
+  - 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)
+
+  -c, --credential USER[:PASSWORD]
+      Credential for Basic Authentication (format: username:password)
+
+  -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)
+
+  -a, --url-arg
+      Allow client to send command line arguments in URL (eg: http://localhost:7681?arg=foo&arg=bar)
+
+  -R, --readonly
+      Do not allow clients to write to the TTY
+
+  -t, --client-option <key=value>
+      Send option to client (format: key=value), repeat to add more options
+
+  -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)
+
+  -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
+
+# 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.