指令別名設定 -- BASH

參考文獻：鳥哥 10.3.1  alias, unalias

I learn Python programming recently. There are many complier i can use for.

I used to use python3.4 but i found this way is too annoying. So, to be speed up coding, i need to typing less words.

Usually, i compile my code like this way:

>> python3.4 xxx.py
--------------------------------------------------------------------

now simplified complier "python3.4" as "Py3":

>>$ alias Py3='python3.4'

--------------------------------------------------------------------

if change back:

>> $ unalias Py3

---------------------------------------------------------------------

check all the simplification

>> alias

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