Saving the Output

The shell makes this easy too
./prog  <  test.in  >  outfile
Now the output from  std::cout  will be in  outfile
Saving  std::cerr  is possible too
./prog  <  test.in  2>  errfile
./prog  <  test.in  >  outfile  2>  errfile
./prog  <  test.in  1>  outfile  2>  errfile
./prog  <  test.in  >  outfile  2>&1
./prog  >  outfile  2>  errfile