env -i your_command

env -i env

env -i HOME="$HOME" LC_CTYPE="${LC_ALL:-${LC_CTYPE:-$LANG}}" PATH="$PATH" USER="$USER" somecommand

ssh localhost somecommand

$ env -i bash --noprofile --norc

% echo Environment in calling shell: vars: $(env |wc -l); echo; ./du; echo; cat du
Environment in calling shell: vars: 43

==> This is the environment: vars: 5
PATH="$PATH"
PWD=/Users/nick
SHLVL=1
SOMETHING_TO_KEEP="$USER"
_=/usr/bin/env
==> The end.

#!/usr/bin/env -i SOMETHING_TO_KEEP="$USER" PATH="$PATH" /bin/sh

echo "==> This is the environment: vars:" $(/usr/bin/env | /usr/bin/wc -l)
/usr/bin/env
echo "==> The end."