用parted调整分区大小

Select the hard disk to be parted

When you execute parted command without any argument, by default it selects the first hard disk drive that is available on your system.

In the following example, it picked /dev/sda automatically as it is the first hard drive in this system.

# parted
GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted)      

To choose a different hard disk, use the select command as shown below.

(parted) select /dev/sdb      

It will throw the following error message when it doesn’t find the given hard disk name.

Error: Error opening /dev/sdb: No medium found
Retry/Cancel? y      

Display all Partitions Using print

Using the print command, you can view all the available partitions in the selected hard disk. The print command also displays hard disk properties such as model, size, sector size and partition table as shown below.

(parted) print
Model: ATA WDC WD5000BPVT-7 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  106MB   105MB   primary   fat16           diag
 2      106MB   15.8GB  15.7GB  primary   ntfs            boot
 3      15.8GB  266GB   251GB   primary   ntfs
 4      266GB   500GB   234GB   extended
 5      266GB   269GB   2682MB  logical   ext4
 7      269GB   270GB   524MB   logical   ext4
 8      270GB   366GB   96.8GB  logical                   lvm
 6      366GB   370GB   3999MB  logical   linux-swap(v1)
 9      370GB   500GB   130GB   logical   ext4      

Resize Partition from One Size to Another Using resize

Using resize parted command, you can increase or decrease the partition size of a partition as shown in the example below.

(parted) resize 9
WARNING: you are attempting to use parted to operate on (resize) a file system.
parted's file system manipulation code is not as robust as what you'll find in
dedicated, file-system-specific packages like e2fsprogs.  We recommend
you use parted only to manipulate partition tables, whenever possible.
Support for performing most operations on most types of file systems
will be removed in an upcoming release.
Start?  [373GB]? 373GB
End?  [500GB]? 450GB      

As shown above, parted command will always warn whenever you are attempting to do something dangerous (i.e : rm, resize, mkfs).

The size of partition 9 is actually reduced from 127GB to 77GB. Verify that the partition is resized properly using the print command as shown below.

(parted) print
Model: ATA WDC WD5000BPVT-7 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  106MB   105MB   primary   fat16           diag
 2      106MB   15.8GB  15.7GB  primary   ntfs            boot
 3      15.8GB  266GB   251GB   primary   ntfs
 4      266GB   500GB   234GB   extended
 5      266GB   316GB   50.0GB  logical   ext4
 6      316GB   324GB   7999MB  logical   linux-swap(v1)
 7      324GB   344GB   20.0GB  logical   ext4
 8      344GB   364GB   20.0GB  logical
 9      373GB   450GB   77.3GB  logical   fat32           lba      

Parted allows you to type unambiguous abbreviation for commands like “p” for print, “sel” for select,etc.

更全面的介绍：http://www.thegeekstuff.com/2011/09/parted-command-examples/