env — run a program in a modified environment
env [OPTION...] [−] [NAME=VALUE...] [ COMMAND [ARG...] ]
Set each NAME to VALUE in the environment and run COMMAND.
−i, −−ignore−environmentstart with an empty environment
−u, −−unset=NAMEremove variable from the environment
−−helpdisplay this help and exit
−−versionoutput version information and exit
A mere − implies −i. If no COMMAND, print the resulting
environment.