Usage:
 sfdisk [options] <device> [...]

Options:
 -s, --show-size           list size of a partition
 -c, --id                  change or print partition Id
     --change-id           change Id
     --print-id            print Id
 -l, --list                list partitions of each device
 -d, --dump                idem, but in a format suitable for later input
 -i, --increment           number cylinders etc. from 1 instead of from 0
 -u, --unit <letter>       units to be used; <letter> can be one of
                             S (sectors), C (cylinders), B (blocks), or M (MB)
 -1, --one-only            reserved option that does nothing currently
 -T, --list-types          list the known partition types
 -D, --DOS                 for DOS-compatibility: waste a little space
 -E, --DOS-extended        DOS extended partition compatibility
 -R, --re-read             make the kernel reread the partition table
 -N <number>               change only the partition with this <number>
 -n                        do not actually write to disk
 -O <file>                 save the sectors that will be overwritten to <file>
 -I <file>                 restore sectors from <file>
 -V, --verify              check that the listed partitions are reasonable
 -v, --version             display version information and exit
 -h, --help                display this help text and exit

Dangerous options:
 -f, --force               disable all consistency checking
     --no-reread           do not check whether the partition is in use
 -q, --quiet               suppress warning messages
 -L, --Linux               do not complain about things irrelevant for Linux
 -g, --show-geometry       print the kernel's idea of the geometry
 -G, --show-pt-geometry    print geometry guessed from the partition table
 -A, --activate[=<device>] activate bootable flag
 -U, --unhide[=<dev>]      set partition unhidden
 -x, --show-extended       also list extended partitions in the output,
                             or expect descriptors for them in the input
     --leave-last          do not allocate the last cylinder
     --IBM                 same as --leave-last
     --in-order            partitions are in order
     --not-in-order        partitions are not in order
     --inside-outer        all logicals inside outermost extended
     --not-inside-outer    not all logicals inside outermost extended
     --nested              every partition is disjoint from all others
     --chained             like nested, but extended partitions may lie outside
     --onesector           partitions are mutually disjoint

Override the detected geometry using:
 -C, --cylinders <number>  set the number of cylinders to use
 -H, --heads <number>      set the number of heads to use
 -S, --sectors <number>    set the number of sectors to use