1、修改 配置文件  

vi ~/.bashrc  

[root@localhost attendance]# cat ~/.bashrc
# .bashrc

# User specific aliases and functions

alias rm=‘rm -i‘
#alias cp=‘cp -i‘
alias mv=‘mv -i‘

# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi

2、重新加载环境变量
source  ~/.bashrc
3、reboot 重启