Shellscripting question

How could I make a shellscript which will echo "Welcome home, oniichan!" whenever I cd to my home directory?

>>19
That'll just close your shell.
Better also put exec $SHELL on the bottom of your ~/bin/cd.

Note that is horribly inefficient, makes your shell restart every time and parse its configuration files (and print any fortunes or whatever) every time you cd. >>13 is a way better solution.