Just a quick pro-tip: if you need to know the environment variables for a process, you can see them in that process' /proc/${PID}/environ file. The file however shows the environment variables on one line, with a null character as separator. With a simple sed you can show it with newlines instead:

~$ sed -e "s:\x0:\n:g" /proc/144320/environ
TERM=xterm
SHELL=/bin/bash
OLDPWD=/home/swift/docs
USER=root
SUDO_USER=swift
SUDO_UID=1001
USERNAME=root
MAIL=/var/mail/root
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin
PWD=/var/db/pkg/eix
...

The trick is to use \x0 (hexcode 0) for the null character, which the sed command then replaces with a newline.