You can use the commands env, set, and printenv display all environment variables and their value under UNIX-like operating system such as Redhat / RHEL / Fedora / CentOS / Apple OS X/ OpenBSD / FreeBSD / AIX / Linux / HP-UX and others.
Read answer to: "UNIX: Set Environment Variable"
Linux / UNIX: See If Particular Users Are Logged Into Server 
HowTo: Use pwd Command In Linux / UNIX
Solaris UNIX: Show Network Routing Table Information
HP-UX: Find Out If Recommend Security Patch Applied Or Not
TCSH / CSH: set vs setenv Command Differences 
Unix / Linux: Display Color Man Pages
Linux or FreeBSD command to display system time and date
Show all installed packages or software in Linux, FreeBSD, OpenBSD
Python: Delete / Remove filesHowTo: Find Python Version
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