regarding unix specific commands



I dont know if this is the right place to ask this question.


i got this book "The C Odyssey. Unix - The Open, Boundless C"
It is a 1992 edition book


The book speaks of all the unix specific functions


Just quoting an example below:


main()
{


int pid;
pid=getpid();
printf("Process id is \n",pid);



}


I would like to know if this should run on any linux flavour(since this

book talks only on unix/) with gcc compiler installed on it.What I
would like to know is if this book would prove useful to me if i would
like to play around with Linux.

Thanks in advance

.



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