Process completed after opening terminal
To find what was added to your profiles, I ran these commands.

mac $ curl http://data.biostarhandbook.com/install/bash_profile.txt &gt; ~/seebash_profile
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    89  100    89    0     0    513      0 --:--:-- --:--:-- --:--:--   514
mac $ curl http://data.biostarhandbook.com/install/bashrc.txt &gt; ~/seebashrc
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   759  100   759    0     0  17574      0 --:--:-- --:--:-- --:--:-- 17651
mac $ cat seebash_profile 
#
# Source the settings from .bashrc.
#
if [ -f ~/.bashrc ]; then
   source ~/.bashrc
fi
mac $ cat seebash_profile 
#
# Source the settings from .bashrc.
#
if [ -f ~/.bashrc ]; then
   source ~/.bashrc
fi
mac $ 


You get two copies of these lines in each file. You should get rid of one copy in each file. nano is a simple editor you can use to edit these files.

https://linuxize.com/post/how-to-use-nano-text-editor/