fdisk命令来自于英文词组“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]
常用参数:
-b | 指定每个分区的大小 |
---|---|
-l | 列出指定的外围设备的分区表状况 |
-s | 将指定的分区大小输出到标准输出上,单位为区块 |
-u | 搭配”-l”参数列表,会用分区数目取代柱面数目,来表示每个分区的起始地址 |
-v | 显示版本信息 |
参考实例
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):
[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………………