The /etc/services is often found in Linux/Unix.
The complete path and filename of the file where ports and their associated protocols are defined by /etc/services.
It does save information about a lot of services that client applications can use on the computer.
Looking into the file, you will find the service name, port number, and protocol it uses, and other applicable aliases.
the work of the configuration file /etc/services is to help programs to be able to do a getportbyname() sockets call in their code so as to know what port they can use.
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