# vi ~/.bash_history


 清空里面的记录,并退出当前shell

# exit(一定要退出当前shell)
# history
1 vi ~/.bash_history
2 history |grep mysql
3 clear
4 vi ~/.bash_history
5 echo "" > ~/.bash_history
6 vi ~/.bash_history
7 history
8 exit
9 history
#之前的内容被清空!!!
[root@localhost ~]# history
1 history
2 echo "" > ~/.bash_history
3 history
[root@localhost ~]# history -c #也可以清空历史命令
[root@localhost ~]# history
1 history



 history不记录历史命令:

#vi /etc/profile
#HISTSIZE=1000
HISTSIZE=6 #记录历史命令的条数;HISTSIZE=0为不记录


 记得重新载入:

# source /etc/profile



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