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echo>/var/log/wtmp#清除用户登录记录和命令记录
[root
@localhost root]# last //此时即查不到用户登录信息
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echo>/var/log/btmp
[root
@localhost root]# lastb //查不到登陆失败信息
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echo>/var/log/secure #如果没有这个文件，重启syslog进程service syslog restart
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清除历史命令
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cd/root/
echo> .bash_history
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或者
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history-c #清除命令记录
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也可以写个shell脚本，一键清除所有的日志
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#!/bin/sh
cat/dev/null>/var/log/syslog
cat/dev/null>/var/adm/sylog
cat/dev/null>/var/log/wtmp
cat/dev/null>/var/log/maillog
cat/dev/null>/var/log/messages
cat/dev/null>/var/log/openwebmail.log
cat/dev/null>/var/log/maillog
cat/dev/null>/var/log/secure
cat/dev/null>/var/log/httpd/error_log
cat/dev/null>/var/log/httpd/ssl_error_log
cat/dev/null>/var/log/httpd/ssl_request_log
cat/dev/null>/var/log/httpd/ssl_access_log
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原文地址：http://my.oschina.net/liting/blog/478375
