fdisk命令 – 管理磁盘分区

fdisk命令来自英文词组“Partition table manipulator for Linux”的缩写，其功能是用于管理磁盘的分区信息。如果一套几百平米的房子内部没有墙壁，虽然看起来会很敞亮，但是各种声音、气味、物品会随意充斥在整个房子内，让人极不舒适，因此需要用墙壁按照功能进行划分，例如卧室、厕所、厨房、阳台等等。

fdisk命令可以用于对磁盘进行分区操作，用户可以根据实际情况进行合理划分，这样后期挂载和使用时会方便很多。

语法格式：fdisk [参数] [设备名]

常用参数：

参考示例

查看当前系统的分区情况：

[root@linuxcool ~]# fdisk -l
Disk /dev/sda: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5f1d8ee5
Device     Boot   Start      End  Sectors Size Id Type
/dev/sda1  *       2048  2099199  2097152   1G 83 Linux
/dev/sda2       2099200 41943039 39843840  19G 8e Linux LVM
………………省略部分输出信息………………

管理指定硬盘的分区（过程省略，以《Linux就该这么学》第6章节为准）：

[root@linuxcool ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n 
All space for primary partitions is in use.
Command (m for help): m 
Help:
DOS (MBR)
a   toggle a bootable flag
b   edit nested BSD disklabel
c   toggle the dos compatibility flag
Generic
d   delete a partition
F   list free unpartitioned space
l   list known partition types
n   add a new partition
p   print the partition table
t   change a partition type
v   verify the partition table
i   print information about a partition
Misc
m   print this menu
u   change display/entry units
x   extra functionality (experts only)
Script
I   load disk layout from sfdisk script file
O   dump disk layout to sfdisk script file
Save & Exit
w   write table to disk and exit
q   quit without saving changes
Create a new label
g   create a new empty GPT partition table
G   create a new empty SGI (IRIX) partition table
o   create a new empty DOS partition table
s   create a new empty Sun partition table
………………省略部分输出信息………………