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 hadoop

Why is that?

I am on OSX 10.8

Answer 1

Now that we've narrowed down the problem:

1. Run ps -p $$ at the command line to determine that you are, in fact, using a bash shell.
2. Realize that you are in zsh, which means you should be editing your profile in .zshrc.
3. Copy the offending lines from .bash_profile to .zsh, OR
4. Modify your .zshrc to directly source your .bash_profile.

UPDATE: Do what @TC1 mentions in the comments and keep the shell-specific code in each shell's own profile, and from those profiles, only source shell-agnostic code.

Answer 2

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.