startup script

To answer my original question, yes there is, and here is the quote
from O'Reilly's Larning the Bash

source executes the commands in the specified file, in this case
.bash_profile, including any commands that you have added. bash allows
two synonyms for .bash_profile: .bash_login, derived from the C
shell’s file named .login, and .profile, derived from the Bourne shell
and Korn shell files named .profile. Only one of these three is read
when you log in. If .bash_profile doesn’t exist in your home
directory, then bash will look for .bash_login. If that doesn’t exist
it will look for .profile. One advantage of bash’s ability to look for
either synonym is that you can retain your .profile if you have been
using the Bourne shell. If you need to add bash-specific commands, you
can put them in .bash_profile followed by the command source .profile.
When you log in, all the bash-specific commands will be executed, and
bash will source .profile, executing the remaining commands. If you
decide to switch to using the Bourne shell you don’t have to modify
your existing files. A similar approach was intended for .bash_login
and the C shell .login, but due to differences in the basic syntax of
the shells, this is not a good idea.

Cameron Newham. Learning the bash Shell (In a Nutshell (O'Reilly))
(pp. 89-90). O'Reilly Media. Kindle Edition.