修改CentOS的默认启动级别#/etc/inittab
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id:3:initdefault
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CentOS 启动一共有7个级别
0：关机，这个肯定不能设为默认开机级别
1：单用户模式
2：不带网络的多用户模式
3：带网络的多用户模式
4：保留，用户可以自给定义
5：图形界面的多用户模式，x-window
6：重启系统，这个也不能设为默认开机级别
临时启动其它级别
init 3
查看现在启动的级别
runlevel
返回 N 3 表示之前没有运行其它级别，目前级别是3
返回 5 3 表示之前运行的级别是5，目前级别是3
element
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| font-family | |
| font-size | |
| font-style | |
| font-variant | |
| font-weight | |
| letter-spacing | |
| line-height | |
| text-decoration | |
| text-align | |
| text-indent | |
| text-transform | |
| white-space | |
| word-spacing | |
| color | |
|
| bg-attachment | |
| bg-color | |
| bg-image | |
| bg-position | |
| bg-repeat | |
|
| width | |
| height | |
| border-top | |
| border-right | |
| border-bottom | |
| border-left | |
| margin | |
| padding | |
| max-height | |
| min-height | |
| max-width | |
| min-width | |
| outline-color | |
| outline-style | |
| outline-width | |
|
| position | |
| top | |
| bottom | |
| right | |
| left | |
| float | |
| display | |
| clear | |
| z-index | |
|
| list-style-image | |
| list-style-type | |
| list-style-position | |
|
| vertical-align | |
| border-collapse | |
| border-spacing | |
| caption-side | |
| empty-cells | |
| table-layout | |
|
| text-shadow | |
| -webkit-box-shadow | |
| border-radius | |
|
| overflow | |
| cursor | |
| visibility | |
element
|
| font-family | |
| font-size | |
| font-style | |
| font-variant | |
| font-weight | |
| letter-spacing | |
| line-height | |
| text-decoration | |
| text-align | |
| text-indent | |
| text-transform | |
| white-space | |
| word-spacing | |
| color | |
|
| bg-attachment | |
| bg-color | |
| bg-image | |
| bg-position | |
| bg-repeat | |
|
| width | |
| height | |
| border-top | |
| border-right | |
| border-bottom | |
| border-left | |
| margin | |
| padding | |
| max-height | |
| min-height | |
| max-width | |
| min-width | |
| outline-color | |
| outline-style | |
| outline-width | |
|
| position | |
| top | |
| bottom | |
| right | |
| left | |
| float | |
| display | |
| clear | |
| z-index | |
|
| list-style-image | |
| list-style-type | |
| list-style-position | |
|
| vertical-align | |
| border-collapse | |
| border-spacing | |
| caption-side | |
| empty-cells | |
| table-layout | |
|
| text-shadow | |
| -webkit-box-shadow | |
| border-radius | |
|
| overflow | |
| cursor | |
| visibility | |
