Login shell and non-logon shell

Log-in Shell:
Su–username
Su-l username

Non-logon Shell:
SU username
Open Command Window under graphics terminal
Shell scripts that are executed automatically

Bash's configuration file
Global configuration:
/etc/profile,/etc/proflie.d/*.sh,/etc/bashrc
Personal configuration:
~/.bash_profile,~/.bashrc

Profiles class configuration file:
Setting environment variables, running commands or scripts

BASHRC class configuration file:
Set local variables, define command aliases

How the login shell reads the configuration file:
/etc/profile,/etc/profile.d/*.sh,~/.bash_profile,~/.bashrc,/etc/bashrc
How the non-logon shell reads the configuration file:
~/.bashrc,/etc/bashrc,/etc/profile.d/*.sh

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Login shell and non-logon shell