2019
https://zwischenzugs.com/2019/02/27/bash-startup-explained/
    https://habr.com/ru/post/452410/

https://www.gnu.org/software/bash/manual/bash.html#Bash-Startup-Files

https://askubuntu.com/questions/29239/where-is-bash-profile

login (load first of)
.bash_profile
    only in login mode (ssh-ing, C+A+F1-F6)
.bash_login
.profile