fdisk

https://www.cnblogs.com/diantong/p/8820779.html

[root@VM_0_11_centos ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        50G  6.9G   41G  15% /
devtmpfs        487M     0  487M   0% /dev
tmpfs           497M   24K  497M   1% /dev/shm
tmpfs           497M  388K  496M   1% /run
tmpfs           497M     0  497M   0% /sys/fs/cgroup
tmpfs           100M     0  100M   0% /run/user/0
[root@VM_0_11_centos ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help):