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fork compare to exec in linux c program

pid_t  pid=fork()
it has 3 situation for the return result pid
0  child
>0 parent process
<0 fork fail
fork create a new process  and it parent live alse when the child process had been created


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 HowTo WebCam On Linux
Five fun ways to use a Linux webcam
http://www.linux.com/archive/articles/126186
The Webcam HOWTO
http://tldp.org/HOWTO/html_single/Webcam-HOWTO/
WebCam under Linux
http://www.seismo.ethz.ch/linux/webcam.html
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