shell first execute the commands in /etc/profile Next the shell looks for ~/.bash_profile, ~/bash_login, ~/.profile

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The shell first execute the commands in /etc/profile
Next the shell looks for ~/.bash_profile, ~/bash_login, ~/.profile
You can put commands in one of these files to override the defaults set in /etc/profile
A shell running on a virtual terminal doesn’t execute commands in files ~/.bash_profile, ~/bash_login, ~/.profile
Because commands in .bashrc may be executed many times, and subshells inherit exported variables, it is good idea to put commands that add to existing

Variables in the .bash_profile file.

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