kill one process

　　There is an need of kill one port is already in use.

　　The command is :

　　lsof -i:8000

　　There will be a list of:

　　command pid user fd type device size/off node name

The command shows which program is now use the
port, the pid is process id, the user is username of the operator, the fd is
something I don‘t konw, the type is protecol of internet, the device is sth I
don‘t know, the name is the application‘s URL.

　　So, what we need to do to kill the process uses port 8000 is to type the
command:

　　kill pid(the process id showed by the command we type last)

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