# Apache module mod_env

This module is contained in the `mod_env.c` file, and is compiled in by default. It provides for passing environment variables to CGI/SSI scripts. Is is only available in Apache 1.1 and later.

## Summary

This module allows Apache's CGI and SSI environment to inherit environment variables from the shell which invoked the httpd process. CERN web-servers are able to do this, so this module is especially useful to web-admins who wish to migrate from CERN to Apache without rewriting all their scripts

## Directives

- PassEnv
- SetEnv
- UnsetEnv

## PassEnv

Syntax: PassEnv variable variable ...
Context: server config, virtual host
Status: Base
Module: mod_env
Compatibility: PassEnv is only available in Apache 1.1 and later.

Specifies one or more environment variables to pass to CGI scripts from the server's own environment. Example:

        PassEnv LD_LIBRARY_PATH

## SetEnv

Syntax: SetEnv variable value
Context: server config, virtual host
Status: Base
Module: mod_env
Compatibility: SetEnv is only available in Apache 1.1 and later.

Sets an environment variable, which is then passed on to CGI scripts. Example:

        SetEnv SPECIAL_PATH /foo/bin

## UnsetEnv

Syntax: UnsetEnv variable variable ...
Context: server config, virtual host
Status: Base
Module: mod_env
Compatibility: UnsetEnv is only available in Apache 1.1 and later.

Removes one or more environment variables from those passed on to CGI scripts. Example:

        UnsetEnv LD_LIBRARY_PATH