首先最好添加一个空白的磁盘，以免对原数据产生破坏，若果不想添加磁盘也可以，用一个里面数据无关紧要的磁盘，当然前提是必须要对该磁盘内已有的分区进行清空，方法后面第三步会有

1.先看脚本内容：

[root@localhost shell]# cat auto_fdisk.sh

#!/bin/bash

#auto fdisk shell

echo '

n

p

1

#这里的一个空格别忘了，必不可少的，这是创建分区时填写开始柱面时的Enter，也就是使用默认柱面

+100M

n

p

2

#一个空格

+200M

n

p

3

#一个空格

+300M

n

e

4

#两个空格

t

3

82

w'    |    fdisk /dev/sdc

这里我对/dev/sdc创建了3个大小分别为100M，200M，300M的主分区，然后将剩余空间给了扩展分区，并且将第三个分区类型调整为82

2.然后给该脚本赋予可执行权限，最后执行，执行结果是

[root@localhost shell]# chmod +x auto_fdisk.sh

[root@localhost shell]# ./auto_fdisk.sh

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x0cf693d0.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (command 'c') and change display units to

sectors (command 'u').

Command (m for help): Command (m for help): Command action

e   extended

p   primary partition (1-4)

Partition number (1-4): First cylinder (1-2349, default 1): Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-2349, default 2349):

Command (m for help): Command action

e   extended

p   primary partition (1-4)

Partition number (1-4): First cylinder (15-2349, default 15): Using default value 15

Last cylinder, +cylinders or +size{K,M,G} (15-2349, default 2349):

Command (m for help): Command action

e   extended

p   primary partition (1-4)

Partition number (1-4): First cylinder (41-2349, default 41): Using default value 41

Last cylinder, +cylinders or +size{K,M,G} (41-2349, default 2349):

Command (m for help): Command action

e   extended

p   primary partition (1-4)

Selected partition 4

First cylinder (80-2349, default 80): Value out of range.

First cylinder (80-2349, default 80): Using default value 80

Last cylinder, +cylinders or +size{K,M,G} (80-2349, default 2349): Using default value 2349

Command (m for help): Partition number (1-5): Hex code (type L to list codes): Changed system type of partition 3 to 82 (Linux swap / Solaris)

Command (m for help): The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

看一下执行结果

[root@localhost shell]# fdisk -l /dev/sdc

Disk /dev/sdc: 19.3 GB, 19327352832 bytes

255 heads, 63 sectors/track, 2349 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0cf693d0

Device Boot      Start         End      Blocks   Id  System

/dev/sdc1               1          14      112423+  83  Linux

/dev/sdc2              15          40      208845   83  Linux

/dev/sdc3              41          79      313267+  82  Linux swap / Solaris

/dev/sdc4              80        2349    18233775    5  Extended

3.最后如果想重新创建或者使开头提到的情况，需要把一个已有分区清空，可以这样

[root@localhost shell]# dd if=/dev/zero of=/dev/sdc bs=512 count=1

1+0 records in

1+0 records out

512 bytes (512 B) copied, 0.0178267 s, 28.7 kB/s

内核重新读取后再看一下此时的分区情况

[root@localhost shell]# partprobe

Warning: WARNING: the kernel failed to re-read the partition table on /dev/sdb (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.

Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.

Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.

Error: Invalid partition table - recursive partition on /dev/sr0.

[root@localhost shell]# fdisk -l /dev/sdc

Disk /dev/sdc: 19.3 GB, 19327352832 bytes

255 heads, 63 sectors/track, 2349 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

好了，就是这样！

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