Linux pre-defined Variables

Linux pre-defined Variables

Example

Definition of Linux environment variables

I. Temporary Use

That is, it becomes invalid after restart or logout.

Use PATH = $ PATH: Directory: directory... to directly assign values. For example, export PATH = $ PATH:/sbin.

Ii. Long-term Use

In the global file/etc/profile or user-defined file ~ /. Add the above command to bash_profile!

What is the display time format of linux pre-defined environment variable \ T?

I. Temporary Use

That is, it becomes invalid after restart or logout.

Use PATH = $ PATH: Directory: directory... to directly assign values. For example, export PATH = $ PATH:/sbin.

Ii. Long-term Use

In the global file/etc/profile or user-defined file ~ /. Add the above command to bash_profile!