Adicione no .bashrc a chamada aos scripts que interessam:
echo ". ~/bashsnippets/autostart_ssh-agent.sh" >> ~/.bashrc && source ~/.bashrc
echo ". ~/bashsnippets/path_and_branch_terminal_title.sh" >> ~/.bashrc && source ~/.bashrc
echo ". ~/bashsnippets/prompt_with_branch.sh" >> ~/.bashrc && source ~/.bashrc