docs/cmdline-opts/socks5.md
--socks5Use the specified SOCKS5 proxy - but resolve the hostname locally. If the port number is not specified, it is assumed at port 1080.
To specify the proxy on a Unix domain socket, use localhost for host and
append the absolute path to the domain socket. For example:
socks5://localhost/path/to/socket.sock (the scheme may be omitted).
This option overrides any previous use of --proxy, as they are mutually exclusive.
This option is superfluous since you can specify a socks5 proxy with --proxy using a socks5:// protocol prefix. (Added in 7.21.7)
--preproxy can be used to specify a SOCKS proxy at the same time --proxy is used with an HTTP/HTTPS proxy (added in 7.52.0). In such a case, curl first connects to the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS proxy.
This option does not work with FTPS or LDAP.