###linux 下的 history 命令 熟练的使用命令，可以提高工作效率.history 用于显示历史记录的命令.
1.编辑~/.bashrc用于记录时间
HISTFILESIZE=2000
HISTSIZE=2000
HISTTIMEFORMAT="%Y%m%d-%H%M%S: "
export HISTTIMEFORMAT
#export HISTIGNORE='ls'
2.此时查看 ~/bash_history,已经记录时间了
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cd
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vim .bash_history
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vim .bashrc
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exit
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vim .bash_history
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vim .bashrc
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history
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exit
3.可以使用history命令查看
1 20130920-153131: cd
2 20130920-153137: vim .bash_history
3 20130920-153655: vim .bashrc
4 20130920-153815: exit
5 20130920-154151: vim .bash_history
6 20130920-154155: vim .bashrc
7 20130920-154208: history
8 20130920-154214: exit
9 20130920-154223: history
| 4.可模糊查询，history | grep -i “xx” |
[user@linux ~]$ history | grep -i "vim"
1 20130920-151346: vim .bash_history
5 20130920-151402: vim catalina.out
7 20130920-151415: vim .bash_history
8 20130920-151533: vim .bashrc
9 20130920-151555: vim .bash_profile
10 20130920-151609: vim .bash_history
5.清除history记录 但是清除history之后，.bash_history里仍会有历史记录，可以直接删除文件里面的内容。
[user@linux ~]$ history -c
[user@linux ~]$ history
1 20130920-160327: history
[user@linux ~]$
6.如何不让系统记录历史命令
# export HISTSIZE=0
# history
# [Note that history did not display anything]
4.最有用的还是使用Control+R来搜索命令 按下Control+R，然后输入之前用过的命令，会自动不全.
(reverse-i-search)`ba': vim .bash_history