Developing a simple TCP server

This section will develop a TCP server that implements the Echo service. The Echo service is usually implemented using the UDP protocol due to its simplicity, but it can also be implemented with TCP. The Echo service usually uses port number 7, but our implementation will use other port numbers:

$ grep echo /etc/services
echo        7/tcp
echo        7/udp

The TCPserver.go file will hold the Go code of this section and will be presented in six parts. For reasons of simplicity, each connection is handled inside the main() function without calling a separate function. However, this is not the recommended practice.

The first part contains the expected preamble:

package main 
 
import ( 
   "bufio" 
   "fmt" 
   "net" 
   "os" 
   "strings" 
) 

The second part of the TCP server is the following:

func...