I wonder if there is any mainstream program with a more convoluted configuration scheme than bash? Just when think you understand the various invocations of .profile, .bash_profile, .bashrc in login/non-login/interactive/non-interactive modes in home and/or /etc after digesting an article with flowcharts[1], you realize that any invocation can execute arbitrary code from any location, and different distributions (not to mention, macOS, WSL, git-for-Windows, etc) all source different stuff in their default configs (like executing .bashrc in .profile).

[1] https://blog.flowblok.id.au/2013-02/shell-startup-scripts.ht...