"cd" doesn't take effect when running in script, but does in console

I am sure it is a silly question but here is what I am doing:

# pwd
/root/bin

# echo "cd /" > foo

# sh foo

# pwd
/root/bin


How can I make foo script file to change the directory to "/"


Thanks,
Rami

I hope your browser isn't running as root as well.

You need to 'source' the script if you want it to take effect in the current environment.

So rather than
# sh foo

You would do
# source foo
or
# . foo

thx salem. it worked

I am the root.
what do you mean "I hope your browser isn't running as root as well."

--Rami

As in, you lazily did
# firefox &

Now, your browser is running as root, which means anything which manages to compromise your browser will also be running as root. At that point, it's "bye bye" machine, and you're looking for your install disks.