ubuntu使用tab补全命令

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安装使用ubuntu tab补全系统命令：
# apt-get install bash-completion
Reading package lists... Done
Building dependency tree... Done
7 J) b6 g) q9 u' s0 a+ GReading state information... Done

2 t1 N! T2 g; a) \2 p6 t
" Z. |1 R& e* L6 z5 \& p# O- ^补全tab