>env - foo=bar environment=unsafe sleep 100 &
[1] 28318

>ps e | grep sl[e]ep
28318 pts/0    S      0:00 sleep 100 foo=bar environment=unsafe

>

##</code><code>##

>foo=bar environment=unsafe sleep 100 &
[1] 28338

>ps e | grep sl[e]ep
28338 pts/0    S      0:00 sleep 100 foo=bar environment=unsafe TERM=xterm SHELL=/bin/bash (... and many more)

>