how to create a persistent USB serial connection between raspberry pi & arduino?

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i have raspberry pi connected via usb arduino.  can build , upload pi using inotool. 
i want mini server connect arduino, maintain connection, , pass strings , forth.
i want able send instructions arduino php.  i'm guessing need pipe using exec()?
i want able messages php mini server.  @ speed i'm going time delay not big deal.

i've found many tutorials listening serial in linux.  haven't found yet sending.

can me, please?

quote
i've found many tutorials listening serial in linux.  haven't found yet sending.

the serial port file, far linux concerned. can read it. can write it.


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