六、/etc/inittab文件错误
[root@ ~]# cat /etc/inittab
#
# inittab
This file describes how the INIT process should set up
#
the system in a certain run-level.
#
# Author:
Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org>
#
Modified for RHS Linux by Marc Ewing and Donnie Barnes
#
# Default runlevel. The runlevels used by RHS are:
#
0 - halt (Do NOT set initdefault to this)
#
1 - Single user mode
#
2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#
3 - Full multiuser mode
#
4 - unused
#
5 - X11
#
6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
# System initialization.
si::sysinit:/etc/rc.d/rc.sysinit
l0:0:wait:/etc/rc.d/rc 0
l1:1:wait:/etc/rc.d/rc 1
l2:2:wait:/etc/rc.d/rc 2
l3:3:wait:/etc/rc.d/rc 3
l4:4:wait:/etc/rc.d/rc 4
l5:5:wait:/etc/rc.d/rc 5
l6:6:wait:/etc/rc.d/rc 6
# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/sbin/shutdown -t3 -r now
# When our UPS tells us power has failed, assume we have a few minutes
# of power left.
Schedule a shutdown for 2 minutes from now.
# This does, of course, assume you have powerd installed and your
# UPS connected and working correctly.
pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"
# If power was restored before the shutdown kicked in, cancel it.
pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"
# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6
# Run xdm in runlevel 5
x:5:respawn:/etc/X11/prefdm -nodaemon
然后把文件删除，重启系统：
[root@ ~]# rm /etc/inittab
rm：是否删除 一般文件 “/etc/inittab”? y
[root@ ~]# reboot
结果显示不存在系统运行的进程，就是因为/etc/inittab的丢失造成的，当然修复的话不可能
手写进去了，那么多内容啊！
这时候进入救援模式，安装initscripts软件包，自动创建/etc/inittab文件
当然要通过mount /dev/dhc
/media/cdrom/挂载光驱，然后安装rpm包
登陆了系统，可以查看到该文件了！