看到这么一句话 不过我试了一下 dd bs=1024 count=100 of=a.txt if=/dev/zero然后 cat < /dev/null > a.txt a.txt的文件大小确实变成0了，这个和上面说的不太一致，是我理解错了？大家能解释下吗

今天dmesg,发现几条记录: arp info overwritten for 192.168.16.2 by 00:0f:b5:19:73:fe on fxp3 arp info overwritten for 192.168.16.2 by 00:13:72:06:5b:ad on fxp3 arp info overwritten for 192.168.16.2 by 00:0f:b5:19:73:fe on fxp3 arp info overwritten for 192.168.16.2 by 00:13:72:06:5b:ad on fxp3 arp info overwritten for 192.168.16.2 by 00:0f:b5:19:73:fe on fxp3 ..... 看来是mac地址:00:0f:b5:19:73:fe和...

出错信息： conslog: Mar 5*12:11:15 CMN: NOTICE: cmn 63923 arp info overwritten for 199.100.1.131 by 00:07:eb:44:c1:e0 conslog: Mar 5*12:11:15 CMN: NOTICE: cmn 63923 arp info overwritten for 199.100.1.131 by 00:00:0c:07:ac:09 00:00:0c:07:ac:09 是路由器地址，00:07:eb:44:c1:e0 不知道是哪里来的。 怎么解决？急！！！

出错信息：\r\n\r\nconslog: Mar 5*12:11:15 CMN: NOTICE: cmn 63923 arp info overwritten for 199.100.1.131 by 00:07:eb:44:c1:e0 \r\nconslog: Mar 5*12:11:15 CMN: NOTICE: cmn 63923 arp info overwritten for 199.100.1.131 by 00:00:0c:07:ac:09 \r\n\r\n00:00:0c:07:ac:09 是路由器地址，00:07:eb:44:c1:e0 不知道是哪里来的。\r\n\r\n怎么解决？急！！！

root用户，输入shutwn -y -g0，有一提示，1086 hangup,可以到正常的关机提示画面，但关电源按键后，不关机而重启计算机。请教造成原因，如何处理，谢！！

[root@linux ~]# shutdown Usage: shutdown [-akrhfnc] [-t secs] time [warning message] -a: use /etc/shutdown.allow -k: don't really shutdown, only warn. -r: reboot after shutdown. -h: halt after shutdown. -f: do a 'fast' reboot (skip fsck). -F: Force fsck on re...

shutdown\r\n:sweat:

装好5.05以后，shutdown使用以后 显示　shutdown started 后面就是机器的时间日期了　 什么问题？ 如何解决？

安装apache时，有两个错误提示，如下： 1. error while loading shared libraries: libmysqlclient_r.so.15: cannot open shared object file: No such file or directory 2.error: cannot run C compiled programs. 各位高手有碰到这种情况的吗？该如何解决？ ---------------------------------------------------------------------------------- configure:4352: checking whether the C compiler works configure:4362: ....