（1）[root@tf ~]# alias rm='echo do not use rm command'
[root@tf ~]# vim /etc/profile   
alias rm='echo do not use rm command'
[root@tf ~]# source /etc/profile 

（2）[root@tf ~]# vim /root/.bashrc 
# .bashrc

# User specific aliases and functions

#alias rm='rm -i'     注释掉这一行
alias cp='cp -i'
alias mv='mv -i'

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