Hi Professor, If i come across any inconsistent rows more than the header i should be redirect them to stderr.I was trying the same ,still its print me the msg on the screen(redirected to /dev/stderr).so i tried with simple echo statement in terminal to check whether its really redirecting or not.but still its showing me on screen.but when i use the path /dev/null it not showing. So am i doing wrong in redirection or should be done differently? Thanks.