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curl/docs/cmdline-opts/abstract-unix-socket.d

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+Long: abstract-unix-socket
+Arg: <path>
+Help: Connect via abstract Unix domain socket
+Added: 7.53.0
+Protocols: HTTP
+Category: connection
+---
+Connect through an abstract Unix domain socket, instead of using the network.
+Note: netstat shows the path of an abstract socket prefixed with '@', however
+the <path> argument should not have this leading character.