[root@localhost ~]# alias
#查询命令别名
[root@1ocalhost ~] # alias 别名='原命令'
#设定命令别名

[root@localhost ~]# alias
#查询系统中已经定义好的别名
alias cp='cp -i'
alias l='ls -d .* --color=auto'
alias ll='ls -1 --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
[root@localhost ~]# alias vi='vim' #定义vim命令的别名是vi
[root@localhost ~]# alias
#重新查询别名
alias cp='cp -i'
alias l.='ls -d .* --color=auto'
alias ll='ls -1 --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
alias vi='vim'
#别名已经生效
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'

[root@localhost ~]# alias sto='/usr/local/apache2/bin/apachectl stop'
[root@localhost ~]# alias sta='/usr/local/apache2/bin/ apachectl start'

[root@localhost ~】# vi /root/.bashrc
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
alias vi='vim'
alias sto='/usr/local/apache2/bin/apachectl stop' alias sta='/usr/local/apache2/bin/apachectl start'
#Source global definitions
if [ -f /etc/bashrc ];then
./etc/bashrc
fi

[root@localhost ~]# unalias vi