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The default shell used by ttylinux is GNU bash. You can change the startup environment (variables, aliases, etc) in /etc/profile. You can also put files into the directory /etc/profile.d - all readable files in that directory will be sourced by bash when you login on the ttylinux machine.
Using /etc/profile.d is a good choice for your own personal changes. You may want to update to a new version of ttylinux sometime later, and you could end up loosing all your changes to /etc/profile if you forget to make a backup. In /etc/profile.d, your changes are safe.