The default shell used by ttylinux is GNU bash. The shell environment of aliases and variables is in /etc/profile; view this file after login to become familiar with the default shell environment.
Upon login, the PATH environmental variable has the following paths in the order listed.
/bin /usr/bin /sbin /usr/sbin
Put additional, or overriding, shell environment in scripts in the /etc/profile.d directory; do not change /etc/profile in order to avoid losing changes when updating ttylinux.