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The env command

The env command in Linux/Unix is used to either print a list of the current environment variables or to run a program in a custom environment without changing the current one.

Syntax

env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]

Usage

1. Print out the set of current environment variables

   env 
   

2. Run a command with an empty environment

    env -i command_name
   

3. Remove variable from the environment

   env -u variable_name
   

4. End each output with NULL

   env -0 
   

Full List of Options

Short Flag	Long Flag	Description
-i	--ignore-environment	Start with an empty environment
-0	--null	End each output line with NUL, not newline
-u	--unset=NAME	Remove variable from the environment
-C	--chdir=DIR	Change working directory to DIR
-S	--split-string=S	Process and split S into separate arguments. It's used to pass multiple arguments on shebang lines
-v	--debug	Print verbose information for each processing step
-	--help	Print a help message
-	--version	Print the version information