Why do I need to source bash_profile every time

Question

I have installed Hadoop and every time I want to run it, first I have to do this:

source ~/.bash_profile

or it won\'t recognize the command

Answer 1

I tried the approved answer. Changing the .zshrc file works for one of my machines. But for the other one, when I run ps -p $$, it is -sh under the command. And I changed both bash and zsh files, neither of them works for me this time.

So I found this https://www.gnu.org/software/bash/manual/html_node/Bash-Startup-Files.html

it mentioned "When Bash is invoked as an interactive login shell, or as a non-interactive shell with the --login option, it first reads and executes commands from the file /etc/profile, if that file exists. "

so I went to that file /etc/profile and add "source ~/.bashrc" in that file. Then it works since every time a terminal is opened, it runs the command in that /etc/profile file.