Linux environment variable display

Env
 
Name: run a program in a modified Environment
 
Overview:
 
Env [Options]... [-] [Name = Value]... [Command [Arg]…]
 
Description:
 
Set the Name Value to Value in the environment and run the specified Command
 
Option:
 
-I, -- ignore-environment: started in an empty environment
 
-U, -- unset = Name: remove the specified variable Name from the Environment
 
-- Help: displays help information and exits.
 
-- Version: displays the version information and exits.
 
-Only for compatibility-I. Promise the environment variables if no command is specified
 
Instance:
 
Env # print all environment variables in the environment
 
Env-I HOME = $ HOME ls $ HOME # start with an empty environment, set the value of the variable HOME, and run the ls command
Author: "huangyandong"