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telnet implementation usin C

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http://unix.stackexchange.com – The program in general is I want to implement telnet program. On the client side user send its logging name and password, and if it is correct he starts to send commands to the server On the Server side I am check on the user authentication on the system and if it is true I must run his default shell which is stored in the passwd file, to execute his commands. The problem that when I tried to run his shell using the system C function the shell is run and then closed, because the system() use fork() and exec(), and after it finished the opened shell for the user is closed. How can I run a n (HowTos)