vi ~/.bashrc 放开上面几行
ll"># You may uncomment the following lines if you want `ls' to be colorized:
# 设置语法及文件夹高亮显示
export LS_OPTIONS='--color=auto'
eval "`dircolors`"
# alias ls='ls $LS_OPTIONS'
# 设置ll,l 别名
alias ll='ls $LS_OPTIONS -l'
alias l='ls $LS_OPTIONS -lA'
#
source ~/.bashrc 生效。
有C++难题，加我！