[root@centos ~]# echo "alias catfs='cat /etc/fstab'" >> /etc/bashrc
[root@centos ~]# source /etc/bashrc
[root@centos ~]# alias
alias catfs='cat /etc/fstab'
alias egrep='egrep --color=auto'
...
[root@centos ~]# useradd user
[root@centos ~]# su - user
[root@centos ~]$ alias
alias catfs='cat /etc/fstab'
alias egrep='egrep --color=auto'
...