ss-local:tldr:5a9a1

The command "ss-local --fast-open" is used to initiate a shadowsocks local process with the fast-open option enabled. Here is a breakdown of the command and its components:

1. "ss-local": It refers to the shadowsocks local program, which acts as a client that connects to a remote shadowsocks server and forwards network traffic through an encrypted tunnel.

2. "--fast-open": This option enables the TCP Fast Open feature. TCP Fast Open is a mechanism that allows sending data in the initial SYN packet of a TCP handshake, reducing the delay in establishing a connection and improving the overall connection speed.

By running the command "ss-local --fast-open", you are starting the shadowsocks local client with the fast-open option enabled, which can enhance the connection speed between the client and the shadowsocks server.