Surround the content of echo with double quotes. To get a newline before the new alias, use echo -e and insert a newline \n:
echo -e "\nalias cdear='cd | clear'" >> .bashrc
Echoing aliases into a .bashrc file
Surround the content of echo with double quotes. To get a newline before the new alias, use echo -e and insert a newline \n:
echo -e "\nalias cdear='cd | clear'" >> .bashrc