[root@XM 123]# cat >>/etc/profile<<EOF
> alias grep='grep --color=auto'
> alias egrep='egrep --color=auto'
> EOF
[root@XM 123]# grep "grep" /etc/profile
alias grep='grep --color=auto'
alias egrep='egrep --color=auto'
[root@XM 123]# source /etc/profile ##使环境变量生效