#echo "$R" >;>; /etc/issue

#echo "Kernel $(uname -r) on $a $(uname -m)" >;>; /etc/issue

#

#cp -f /etc/issue /etc/issue.net

#echo >;>; /etc/issue

--

然后，做下面的事情:

[root@deep]# rm -f /etc/issue

[root@deep]# rm -f /etc/issue.net

[root@deep]# touch /etc/issue

[root@deep]# touch /etc/issue.net
 

21. 被root拥有的程序的位。

移走那些被root拥有程序的s位标志，当然有些程序需要这个，用命令‘chmod a-s’完成这个。

注：前面带（*）号的那些程序一般不需要拥有s位标志。

[root@deep]# find / -type f \( -perm -04000 -o -perm -02000 \) \-exec ls –lg {} \;

-rwsr-xr-x 1 root root 33120 Mar 21 1999 /usr/bin/at

*-rwsr-xr-x 1 root root 30560 Apr 15 20:03 /usr/bin/chage

*-rwsr-xr-x 1 root root 29492 Apr 15 20:03 /usr/bin/gpasswd

-rwsr-xr-x 1 root root 3208 Mar 22 1999 /usr/bin/disable-paste

-rwxr-sr-x 1 root man 32320 Apr 9 1999 /usr/bin/man

-r-s--x--x 1 root root 10704 Apr 14 17:21 /usr/bin/passwd

-rws--x--x 2 root root 517916 Apr 6 1999 /usr/bin/suidperl

-rws--x--x 2 root root 517916 Apr 6 1999 /usr/bin/sperl5.00503

-rwxr-sr-x 1 root mail 11432 Apr 6 1999 /usr/bin/lockfile

-rwsr-sr-x 1 root mail 64468 Apr 6 1999 /usr/bin/procmail

-rwsr-xr-x 1 root root 21848 Aug 27 11:06 /usr/bin/crontab

-rwxr-sr-x 1 root slocate 15032 Apr 19 14:55 /usr/bin/slocate

*-r-xr-sr-x 1 root tty 6212 Apr 17 11:29 /usr/bin/wall

*-rws--x--x 1 root root 14088 Apr 17 12:57 /usr/bin/chfn

*-rws--x--x 1 root root 13800 Apr 17 12:57 /usr/bin/chsh

*-rws--x--x 1 root root 5576 Apr 17 12:57 /usr/bin/newgrp

*-rwxr-sr-x 1 root tty 8392 Apr 17 12:57 /usr/bin/write

-rwsr-x--- 1 root squid 14076 Oct 7 14:48 /usr/lib/squid/pinger

-rwxr-sr-x 1 root utmp 15587 Jun 9 09:30 /usr/sbin/utempter

*-rwsr-xr-x 1 root root 5736 Apr 19 15:39 /usr/sbin/usernetctl

*-rwsr-xr-x 1 root bin 16488 Jul 6 09:35 /usr/sbin/traceroute

-rwsr-sr-x 1 root root 299364 Apr 19 16:38 /usr/sbin/sendmail

-rwsr-xr-x 1 root root 34131 Apr 16 18:49 /usr/libexec/pt_chown

-rwsr-xr-x 1 root root 13208 Apr 13 14:58 /bin/su

*-rwsr-xr-x 1 root root 52788 Apr 17 15:16 /bin/mount

*-rwsr-xr-x 1 root root 26508 Apr 17 20:26 /bin/umount

*-rwsr-xr-x 1 root root 17652 Jul 6 09:33 /bin/ping

-rwsr-xr-x 1 root root 20164 Apr 17 12:57 /bin/login

*-rwxr-sr-x 1 root root 3860 Apr 19 15:39 /sbin/netreport

-r-sr-xr-x 1 root root 46472 Apr 17 16:26 /sbin/pwdb_chkpwd (责任编辑：IT)