改变系统启动运行等级的shell脚本

作者：777

# cat chlevel
-----------------------------------------------------------
#!/bin/bash
# change the run level at the boot time.
#time :2003.8.5
grep id /etc/inittab
echo "Are you want change the runlevel at the boot ? (y/n) "
read num
if [ $num = "y" ];then
if [ -e /etc/inittab ]
then echo "Input a number for runlevel at system boot:"
read level
if [[ $level = ^[0-9] || ${#level} > 1 ]]
then echo "The number is wrong."
else
if [[ $level >0 && $level <6 ]]
then cat /etc/inittab|sed 's/id:[12345]:in/id:'$level':in/'>h&&cat h>/etc/inittab
rm -fr h&&chmod 644 /etc/inittab
else echo "The number is wrong!"
fi;fi
else echo "File not found!"
fi;else echo "The run level have not change!"
fi
grep id /etc/inittab