environment variable configuration file for Shell programming

1. Introduction to environment variable configuration file

　　

1.1 Source command:Source configuration file or . configuration file

After you modify the configuration file, you must log off and re-login to take effect, using the source command without having to log in again

1.2 Environment variable configuration file:

Defines system default environment variables, such as path, that are in effect for the operating environment of the system

1.3 Common environment variables when landing:

　　　　

2. Environment variable configuration file function

　　

The role of 2.1/etc/profile:

-User Variables

-LogName Variable

-Mail variables

-Path variable

-Hostname variable

-Histsize variable

-Umask

-Call the/etc/profile.d/*.sh file

The role of 2.2/ETC/BASHRC:

-PS1 variable

-Umask

-Path variable

-Call the/etc/profile.d/*sh file

The role of 2.3 ~/.bash_profile:

-called the ~/.BASHRC file

-Added ": $HOME/bin" to the directory after the PATH variable

The role of 2.4 ~/.BASHRC

-Define default aliases

-Call/ETC/BASHRC

3. Other environment variable configuration files

3.1 Environment variables in effect when you log off profile: ~/.bash_logout

3.2 History Command Store file: ~/.bash_history

3.3 Shell Login Information:

Local terminal welcome information:/etc/issue

　　　　　　

Remote Terminal Welcome information:

　　　　　　

Welcome information after Login (recommended):/ETC/MOTD

Both local and remote can be displayed

environment variable configuration file for Shell programming