Usage:
 partx [-a|-d|-s|-u] [--nr <n:m> | <partition>] <disk>

Tell the kernel about the presence and numbering of partitions.

Options:
 -a, --add            add specified partitions or all of them
 -d, --delete         delete specified partitions or all of them
 -u, --update         update specified partitions or all of them
 -s, --show           list partitions

 -b, --bytes          print SIZE in bytes rather than in human readable format
 -g, --noheadings     don't print headings for --show
 -n, --nr <n:m>       specify the range of partitions (e.g. --nr 2:4)
 -o, --output <list>  define which output columns to use
     --output-all     output all columns
 -P, --pairs          use key="value" output format
 -r, --raw            use raw output format
 -S, --sector-size <num>  overwrite sector size
 -t, --type <type>    specify the partition type
     --list-types     list supported partition types and exit
 -v, --verbose        verbose mode

 -h, --help           display this help
 -V, --version        display version

Available output columns:
         NR  partition number
      START  start of the partition in sectors
        END  end of the partition in sectors
    SECTORS  number of sectors
       SIZE  human readable size
       NAME  partition name
       UUID  partition UUID
       TYPE  partition type (a string, a UUID, or hex)
      FLAGS  partition flags
     SCHEME  partition table type (dos, gpt, ...)

For more details see partx(8).