One day Linux Command (8) export environment variable

Export

Function Description: sets or displays environment variables.

Syntax: Export [-FNP] [variable name] = [variable setting value]
Note: When executing a program in shell, shell provides a set of environment variables. Export allows you to add, modify, or delete environment variables for subsequent programs. The effect of export is only true for this login operation.
Parameters:
-F indicates the function name in [variable name.
-N: Delete the specified variable. The variable is not actually deleted, but is not output to the execution environment of subsequent commands.

-P: list all environment variables that the shell assigns to the program.

Example:

Example 1: add the path/home/bin to the path environment variable.

$ Export Path = $ path:/home/bin

You can run the echo command to test whether the/home/bin directory has been added.

$ Echo $ path

In addition:You can modify the environment variables in either of the following ways. You must log out of the system again to make the changes take effect.
1. Modify the profile file:
# Vi/etc/profile
Add:
Export Path = "$ path:/opt/au1200_rm/build_tools/bin"
2. Modify the. bashrc file:
# Vi/root/. bashrc
Add:
Export Path = "$ path:/opt/au1200_rm/build_tools/bin"