Ubuntu environment variable configuration file and ubuntu environment variable

Ubuntu environment variable configuration file and ubuntu environment variable

Ubuntu usually uses the following configuration files:

/Etc/environment,/etc/profile,/etc/bash. bashrc ,~ /. Profile ,~ /. Bashrc

Differences between them:

①/Etc/environment

This file is the first configuration file read during Ubuntu login, and environment variables are set for all processes.

②/Etc/profile

The second file read when this file is used to configure the environment variables of all users in the system

③/Etc/bash. bashrc

All initialization files of a shell (User Interface)

④ ~ /. Profile

Configure the personal work environment of the currently logged-on user

⑤ ~ /. Bashrc

The initialization file of the current user each time the shell is opened

Execution sequence:

/Etc/environment -->/etc/profile --> ~ /. Profile -->/etc/bash. bashrc --> ~ /. Bashrc

Instructions to make environment variables take effect:

Source/xxx