partx − tell the kernel about the presence and numbering of on−disk partitions
partx [−a|−d|−P|−r|−s|−u] [−t type] [−n M:_N_] [−] disk
partx [−a|−d|−P|−r|−s|−u] [−t type] partition [disk]
Given a device or disk−image, partx tries to parse the partition table and list its contents. It can also tell the kernel to add or remove partitions from its bookkeeping.
The disk argument is optional when a partition argument is provided. To force scanning a partition as if it were a whole disk (for example to list nested subpartitions), use the argument "−" (hyphen−minus). For example:
partx −−show − /dev/sda3
This will see sda3 as a whole−disk rather than as a partition.
partx is not an fdisk program − adding and removing partitions does not change the disk, it just tells the kernel about the presence and numbering of on−disk partitions.
Add the specified partitions, or read the disk and add all partitions.
Print the sizes in bytes rather than in a human−readable format.
By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power of 2^10 (1024). Abbreviations of symbols are exhibited truncated in order to reach a better readability, by exhibiting alone the first letter of them; examples: "1 KiB" and "1 MiB" are respectively exhibited as "1 K" and "1 M", then omitting on purpose the mention "iB", which is part of these abbreviations.
Delete the specified partitions or all partitions. It is not error to remove non−existing partitions, so this option is possible to use together with large −−nr ranges without care about the current partitions set on the device.
Do not print a header line with −−show or −−raw.
List the partitions. Note that all numbers are in 512−byte sectors. This output format is DEPRECATED in favour of −−show. Do not use it in newly written scripts.
−n, −−nr M:N
Specify the range of partitions. For backward compatibility also the format M−N is supported. The range may contain negative numbers, for example −−nr −1:−1 means the last partition, and −−nr −2:−1 means the last two partitions. Supported range specifications are:
Specifies just one partition (e.g. −−nr 3).
Specifies the lower limit only (e.g. −−nr 2:).
Specifies the upper limit only (e.g. −−nr :4).
Specifies the lower and upper limits (e.g. −−nr 2:4).
−o, −−output list
Define the output columns to use for −−show, −−pairs and −−raw output. If no output arrangement is specified, then a default set is used. Use −−help to get list of all supported columns. This option cannot be combined with the −−add, −−delete, −−update or −−list options.
Output all available columns.
List the partitions using the KEY="value" format.
List the partitions using the raw output format.
List the partitions. The output columns can be selected and rearranged with the −−output option. All numbers (except SIZE) are in 512−byte sectors.
−t, −−type type
Specify the partition table type.
List supported partition types and exit.
Update the specified partitions.
−S, −−sector−size size
Overwrite default sector size.
Display help text and exit.
Print version and exit.
enables libblkid debug output.
partx −−show /dev/sdb3, partx −−show −−nr 3 /dev/sdb, partx −−show /dev/sdb3 /dev/sdb
All three commands list partition 3 of /dev/sdb.
partx −−show − /dev/sdb3
Lists all subpartitions on /dev/sdb3 (the device is used as whole−disk).
partx −o START −g −−nr 5 /dev/sdb
Prints the start sector of partition 5 on /dev/sdb without header.
partx −o SECTORS,SIZE /dev/sda5 /dev/sda
Lists the length in sectors and human−readable size of partition 5 on /dev/sda.
partx −−add −−nr 3:5 /dev/sdd
Adds all available partitions from 3 to 5 (inclusive) on /dev/sdd.
partx −d −−nr :−1 /dev/sdd
Removes the last partition on /dev/sdd.
Davidlohr Bueso <email@example.com>, Karel Zak <firstname.lastname@example.org>
The original version was written by Andries E. Brouwer <email@example.com>
addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8)
For bug reports, use the issue tracker at <https://github.com/util−linux/util−linux/issues>.
The partx command is part of the util−linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util−linux/>.