Let alias make better life on Mac or Linux system

CD ～

vi .bash_profile

add alias in the file

alias ctaws=’ssh -i /Users/Alvis/.ssh/awsvuewebsite.pem ec2-user@ec2-52-194-128-68.ap-northeast-1.compute.amazonaws.com’

alias abc=”ssh  root@123.42.21.123″

（abc as the alias , can be used to instead of command line ）

:wq!

source ~/.bash_profile        //* reload to update the setting of .bash_profile