Bash startup files

Bash Startup Files Parsing Order

File	`-li`	`-l`	`-i`
`/etc/profile`	1	1
`~/.bash_profile`	2.1	2.1
`~/.bash_login`	2.2	2.2
`~/.profile`	2.3	2.3
`~/.bashrc`			1
`$BASH_ENV`				1
`~/.bash_logout`	3	3

Login Bash sources the first existing and readable file from the following list:
- ~/.bash_profile
- ~/.bash_login
- ~/.profile
~/.bashrc is sourced by Bash as interactive shell only.
$BASH_ENV:
- environment variable with the filename of init script;
- sourced only before executing Bash script as non-interactive shell;
- applied expansions (in order):
  - parameter expansion;
  - arithmetic expansion;
  - command substitution.