Problems

Please check the following commands and their outputs!

D:tmp>@echo off

//// command 1
for /f "tokens=1,* delims==" %f in ('set') do set %f=

//// command 2
set

//// command 3
for /f "tokens=1,* delims==" %f in ('set') do echo %f
COMSPEC
CONDA_BAT
CONDA_EXE
CONDA_SHLVL
PATH
PATHEXT
PROMPT

• Command 1 is to unset all the variables
• Command 2 is to show the variables, and indeed there’s no output
• Command 3 is to show the variables one by one, and indeed there’re some variables
  • Notice:
    • the set command run in the sub-shell
    • if a batch file run, the environment variables can be seen.
    • When running on powershell, the environment variables are gone in the sub shell.

My Questions

How can I unset the above environment variables, in that the new program cannot see them?

• The above document already includes my tries.
• I also did on powershell, all the variables are gone in the new program.