If you want `which' to inform you about aliases and shell functions in bash, then you need to add the following five lines to your $HOME/.bash_profile:
which ()
{
(alias; declare -f) | /usr/bin/which --tty-only --read-alias --read-functions --show-dot --show-tilde'
}
export -f which
This is the recommended use of this `which'. Note that the rpm already adds this to /etc/profile.d; there is no need to add it to $HOME/.bash_profile if you installed the rpm.
The C shell (csh, tcsh) doesn't have shell functions, but fortunately inherites aliases in subshells. To support aliases with a C shell add the following line to your .profile:
alias which 'alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'