PATH
The $PATH is searched from beginning to end, with the first win
SET PATH=C:\cygwin\bin;%PATH%
Window 路徑 ENV VAR
* 可以在 "開始" -> "執行 " 輸入它們
%SystemDrive% # C:
%systemroot% # C:\WINDOWS
%homepath% # C:\Documents and Settings\{username}
%ProgramFiles% # C:\Program Files
%AppData% # C:\Users\{username}\AppData\Roaming
%LocalAppData% # C:\Users\{username}\AppData\Local
%UserProfile% # C:\Users\{username}
%UserName% # {username}
%COMPUTERNAME% # {computername}