From LQWiki

This is a disambiguation page - it contains links to different pages which are referenced here under the same page name. If you've followed a link and have arrived on this page, you might want to go back and modify the link to point to the most appropriate article which is listed on this page.

Env can be:

• A perl module that imports environment variables as scalars or arrays. See the man page.

• A bash command to list all environment variables.