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PERL getservbyport Function


Syntax

getservbyport PORT, PROTO


Definition and Usage

Translates the service number PORT for the protocol PROTO, returning the service name in a scalar context and the name and associated information in a list context:

($name, $aliases, $port_number, $protocol_name)

This call returns these values based on /etc/services file.

Return Value

  • In scalar context undef on error otherwise service number

  • In list context empty list on error otherwise Service record (name, aliases, port number, protocol name).

Example

Try out following example:

#!/usr/bin/perl

($name, $aliases, $port_number, 
     $protocol_name) = getservbyport(21, "tcp");

print "Name = $name\n";
print "Aliases = $aliases\n";
print "Port Number = $port_number\n";
print "Protocol Name = $protocol_name\n";

It will produce following result

Name = ftp
Aliases =
Port Number = 21
Protocol Name = tcp


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