Linux System Environment variables

Linux which we often use, but when used to not remember, here to make a memo.

Common Variables for Linux:

1. PATH determines to which directories the shell will look for commands or programs
2. Home Current User Home directory
3. Histsize Number of historical records
4. LOGNAME The current user's login name
5. HOSTNAME refers to the name of the host
6. Shell Current User shell type
7. Languge language-related environment variables, multiple languages can modify this environment variable
8. Mail storage directory for the current user of mail
9. PS1 basic prompt, for root user Yes #, for normal user is $

Linux commands:

1. Reset shows all locally defined shell variables
2. Env shows all the environment variables
3. unset Clearing Environment variables

As an example:

$ Export $TEST =test

$ set | grep TEST

Test=Test

$ unset $TEST

Linux System Environment variables