echo "ls -l /home/cs476 | egrep \"^d.*[M|m]ail\" \n"
ls -l /home/cs476 | egrep "^d.*[M|m]ail.*"
echo "............. \n"
echo "ypcat passwd | egrep \"^cs[5-9][0-9]+:\"  | cut -d: -f1 | sort -u  | tee /dev/tty | wc -l \n"
ypcat passwd | egrep "^cs[5-9][0-9]+:"  | cut -d: -f1 | sort -u  | tee /dev/tty | wc -l