在操作Linux命令时，时常出现以下这样一句话
You have mail in /var/spool/mail/root
这个是提示有最新的邮件，你可以使用mail命令阅读
-bash-4.1# mail
Heirloom Mail version 12.4 7/29/08. Type ? for help.
"/var/spool/mail/root": 383 messages 381 unread
1 user@localhost.local Tue Apr 10 20:09 183/7743 "[abrt] full crash report"
2 user@localhost.local Tue Apr 10 20:15 183/7730 "[abrt] full crash report"
3 user@localhost.local Tue Apr 10 20:20 183/7730 "[abrt] full crash report"
4 user@localhost.local Tue Apr 10 20:22 183/7730 "[abrt] full crash report"
然后使用n 编号查看相应邮件，如查看编号为4的邮件
& n 4
Message 4:
From user@localhost.localdomain Tue Apr 10 20:22:07 2012
Return-Path: <user@localhost.localdomain>
X-Original-To: root@localhost
Delivered-To: root@localhost.localdomain
Date: Tue, 10 Apr 2012 20:22:07 +0000
From: user@localhost.localdomain
To: root@localhost.localdomain
Subject: [abrt] full crash report
User-Agent: Heirloom mailx 12.4 7/29/08
Content-Type: text/plain; charset=us-ascii
Status: RO
Duplicate check
使用q键退出mail系统
& q
Held 384 messages in /var/spool/mail/root
You have mail in /var/spool/mail/root
-bash-4.1#
当然，里边都是一些无关紧要的邮件，我们也可以清空，清空很简单，只需要进入/var/spool/mail就好
-bash-4.1# cd /var/spool/mail/
列出了所有用户的邮件
total 14560
-rw-rw---- 1 ni** mail 6774 May 18 17:17 nicholas
-rw-rw---- 1 mysql mail 0 Apr 23 16:58 mysql
-rw------- 1 root mail 14880366 Jul 26 13:50 root
-rw-rw---- 1 www mail 0 Apr 23 18:23 www
删除邮件，比如删除root的邮件，只需要写空就好，最好别删除，否则容易出错
-bash-4.1# echo ''>root
You have mail in /var/spool/mail/root
-bash-4.1# ll
total 12
-rw-rw---- 1 ni** mail 6774 May 18 17:17 nicholas
-rw-rw---- 1 mysql mail 0 Apr 23 16:58 mysql
-rw------- 1 root mail 0 Jul 26 13:54 root
-rw-rw---- 1 www mail 0 Apr 23 18:23 www
这样即可删除烦人的邮件提示了，虽然执行
echo ''>root
会提示
You have mail in /var/spool/mail/root
但实际上邮件内容已经清空，当root文件发生改动，一律都提示You have mail in /var/spool/mail/root
