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
%systemroot% = C:\WINDOWS
%appdata% = C:\Documents and Settings\lwy\Application Data
%homepath% = C:\Documents and Settings\lwy