jim@jupyter:networks$ make
gcc -O2 -pthread hostinfo.c csapp.c -o hostinfo
gcc -O2 -pthread echoserveri.c csapp.c echo.c -o echoserver
gcc -O2 -pthread echoclient.c csapp.c -o echoclient

jim@jupyter:networks$ ./echoserver 8088 &
[1] 30070

jim@jupyter:networks$ ./echoclient localhost 8088
Connected to (localhost.localdomain, 58454)
one
server received 4 bytes
one
two
server received 4 bytes
two
three
server received 6 bytes
three
Hello can you hear this?
server received 25 bytes
Hello can you hear this?
jim@jupyter:networks$ 
jim@jupyter:networks$ jobs
[1]+  Running                 ./echoserver 8088 &
jim@jupyter:networks$ whoami

-----------------------
The cgi-bgin can be run from the command line with :

 $ QUERY_STRING="13&29" ./cgi-bin/adder

-----------------------------
In two different terminals, here is the chat client & server :


    ---- terminal 1 ---------------------------
    jim@jupyter:networks$ ./chatserver 12345
    Waiting for client connection ... 
    Connected to (localhost.localdomain, 37546)
    they said: hello
    they said: one
    they said: two
    Waiting for client connection ... 
    Connected to (localhost.localdomain, 37550)
    they said: one
    they said: two
    I said 1
    And I said it again
    they said: hey
    Waiting for client connection ... 
    ^C
    jim@jupyter:networks$
    
    ---- terminal 2 ---------
    jim@jupyter:networks$ ./chatclient localhost 12345
    hello
    one
    two
    ^D
    jim@jupyter:networks$ jobs
    jim@jupyter:networks$ ./chatclient localhost 12345
    one
    two
    they said: I said 1
    they said: And I said it again
    hey
    ^D
    jim@jupyter:networks$