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Perl in a Nutshell

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Function Reference
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getservbyport port, proto

Translates a service (port) number to its corresponding names. proto is a protocol name such as "tcp". The return value in list context is:

($name, $aliases, $port_number, $protocol_name)
In scalar context, getservbyport returns only the service port name.

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Reference: getservbynameBook IndexReference: getservent