env

vagrant@archlinux env (main) $ ./env -h >> README.md
Usage of ./env:
  -i    clear the environment then run command:
  -u value
        remove variable from the environment and run a program:

Use case

1. Show the environment:

env

2. Clear the environment and run a program:

env -i program

3. Remove variable from the environment and run a program:

env -u variable program

4. Set multiple variables and run a program:

env variable1=value variable2=value variable3=value program