php man page for pam_getenv

PAM_GETENV(8)						User Contributed Perl Documentation					     PAM_GETENV(8)

NAME
       pam_getenv - get environment variables from /etc/environment

SYNOPSIS
       pam_getenv [-l] [-s] env_var

DESCRIPTION
       This tool  will print out the value of env_var from /etc/environment.  It will attempt to expand environment variable references in the
       definition of env_var but will fail if PAM items are expanded.

       The -l option indicates the script should return an environment variable related to default locale information.

       The -s option indicates that the script should return an system default environment variable.

       Currently neither the -l or -s options do anything.  They are included because future versions of Debian may have a separate repository for
       the initial environment used by init scripts and for system locale information.	These options will allow this script to be a stable
       interface even in that environment.

Debian GNU/Linux						    2018-04-05							     PAM_GETENV(8)