shell script to set and delete aliases

1. What is the alias

For example, most people have two or even many names, if you Jiao Yang Aerospace, but then, almost all the family will not be called full name, only the petit name, a word is enough, why?
To put it plainly, it is to facilitate, so the alias is the same, all for quick, easy, and this is set to almost shortcuts.

2. Set the alias (used alias)

Write user-level shell Recall
注意：只对当前用户有使用的权利

source .bashrc

Preparation of system-level files

vim /etc/profile

但是 su student 不行
Preparation of a system-level variables

3. Delete alias

alias 查看