Instead of edit checking afterwards a manual typed script, write a prove script to generate later on scripts.
System change, the script will change while if it can.
Build machine(s) to reproduce machines :)
put it into for example ~/.bashrc will generate a file for afterwards sourc-ing.
程式產生程式，以腳本產生腳本，
程式跟隨系統改變自行更新。
