.bashrc doesn't work on gentoo

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Bash sources /etc/profile, then either ~/.bash_profile, ~/.bash_login, or
~/.profile, in that order. In order for ~/.bashrc to be sourced, you need
to do it from one of these files with a line like this:

[ -f ~/.bashrc ] && . ~/.bashrc

That's for a login shell anyway. See the bash man page or info pages for more.

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Then I create a new file .bash_profile in my home folder, then add above line in it, it works now.