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並前往https://superuser.com/questions/621870/test-if-a-port-on-a-remote-system-is-reachable-without-telnet

Test if a port on a remote system is reachable (without telnet)

Bash has been able to access TCP and UDP ports for a while. From the man page: /dev/tcp/host/port If host is a valid hostname or Internet address, and port ...

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