** create_process ---- File tmpout.txt aaaa 123 xvar ---- File tmperr.txt bbbb 456 ** create_process 2>&1 redirection 123 456 789 ** create_process swap 1-2 123 ** create_process >file 2>&1 ---- File tmpout.txt 123 456 789 ** open_process_in 123 456 ** open_process_out aa bbbb ** open_process_full 123 aa xvar 456 bbbb