This page shows how to get an argument and pass it to function srand as its seed. It is implemented as part of a c++ series of exercises , that I did.

1. In ECC project I need to generate random numbers. I first used time for the job. Since the program ends quickly, in regression from script, this was not too good. So I have moved the seed generation to the script and used arg[cv].
   
   
   1. #include <time.h>
   2. ...
   3. int main(int argc, char *argv[]) {
   4. ...
   5.   if(argc == 1)
   6.     srand ( time(NULL) );
   7.   else {
   8.     seed=atoi(argv[1]);
   9.     srand (seed);
   10. #ifdef DBG_3 //{
   11.     cout << "argv " << argv[1] << " seed " << seed << endl;
   12. #endif //}
   13.   }
   The bash script uses the variable RANDOM to generate random seed.
   
   for i in {1..500} ; do
     ./a.out $RANDOM >> ecc_main_1.txt
   

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