Comparison of Ubuntu/etc/profile and/etc/environment (reproduced)

Transferred from: http://blog.csdn.net/teamlet/article/details/8257853

First add the export LANG=ZH_CN to/etc/profile, exit the system to log in again, login prompt display in English.

Delete the export lang=zh_cn in/etc/profile, add LNAG=ZH_CN to/etc/environment, exit the system to log in again, sign in prompt to display Chinese.

The user environment is established by always executing/etc/profile and then reading the/etc/environment. Why is it as different as the above?

The/etc/environment should be executed first and then executed/etc/profile.
/etc/environment is the environment that sets up the entire system, and/etc/profile is the environment for setting up all users, regardless of the logged-on user, which is related to the logged-on user.
The execution of the system application can be irrelevant to the user environment, but it is related to the system environment, so when you log in, you see the prompt information, such as date, time information display format is related to the system environment Lang, default Lang=en_us, if the system environment LANG=ZH_CN, The message is in Chinese, otherwise it is in English.

For a user's shell initialization, the/etc/profile is executed first, and then the file/etc/environment is read. The/etc/environment is performed first for the entire system. Do you understand that correctly?

/etc/enviroment--/etc/profile-$HOME/.profile--$HOME/.env (if present)

/etc/profile is the environment variable for all users, and/etc/enviroment is the environment variable of the system. The order in which the shell reads the system when logging in should be:

/etc/profile->/etc/enviroment-$HOME/.profile-$HOME/.env
The reason should be the difference between the user environment and the system environment described by JTW.

        if the same variable is in the user environment (/etc/profile) and the system environment (/etc/ Environment) There are different values that should be based on the user environment.


(1)/etc/profile: This file sets the environment information for each user of the system, and the file is executed when the user first logs on. And from the/etc/ The configuration file of the PROFILE.D directory collects the shell settings.
(2)/ETC/BASHRC: Executes this file for each user running the bash shell. When the bash shell is opened, the file is read.
(3) ~/.bash_profile: Each user can use the file to enter shell information dedicated to their own use, when the user logs on, the file is only executed once! By default, he sets some environment variables to execute the user's. bashrc file.
(4) ~/.BASHRC: This file contains bash information dedicated to your bash shell, which is read when you log on and every time you open a new shell.
(5) ~/.bash_logout: Executes the file each time it exits the system (exiting the Bash shell). In addition, variables set in/etc/profile (global) can be applied to any user, while variables set in ~/.BASHRC, etc. (local) Only the variables in/etc/profile are inherited, and they are "parent-child" relationships.
(6) ~/.bash_profile is an interactive, login way to go into bash run ~/.BASHRC is the interactive non-login way into bash normally the two settings are roughly the same, so the former usually calls the latter.

Http://hi.baidu.com/luckycrazycell/blog/item/dda39a33ee3274f01b4cff27.html

After modifying environment, the execution source/etc/environment takes effect immediately!

Comparison of Ubuntu/etc/profile and/etc/environment (reproduced)