Linux/UNIX 和 Windows平台下要怎麼知道環境變數?

In a command line expecting to see everything in your path on startup and saw only ‘PATH’

[LINUX/UNIX]
For those of you working with LINUX/UNIX and you’ve typed:
c:> echo $PATH

[windows]
How do I view/see the PATH in a windows environment?
c:> echo %path%