Nokia-N900:~# sfdisk
sfdisk version 3.08 (aeb@cwi.nl, 040824) from util-linux-2.12r
Usage: sfdisk [options] device ...
device: something like /dev/hda or /dev/sda
useful options:
    -s [or --show-size]: list size of a partition
    -c [or --id]:        print or change partition Id
    -l [or --list]:      list partitions of each device
    -d [or --dump]:      idem, but in a format suitable for later input
    -i [or --increment]: number cylinders etc. from 1 instead of from 0
    -uS, -uB, -uC, -uM:  accept/report in units of sectors/blocks/cylinders/MB
    -T [or --list-types]:list the known partition types
    -D [or --DOS]:       for DOS-compatibility: waste a little space
    -R [or --re-read]:   make kernel reread partition table
    -N# :                change only the partition with number #
    -n :                 do not actually write to disk
    -O file :            save the sectors that will be overwritten to file
    -I file :            restore these sectors again
    -v [or --version]:   print version
    -? [or --help]:      print this message
dangerous options:
    -g [or --show-geometry]: print the kernel's idea of the geometry
    -G [or --show-pt-geometry]: print geometry guessed from the partition table
    -x [or --show-extended]: also list extended partitions on output
                             or expect descriptors for them on input
    -L  [or --Linux]:      do not complain about things irrelevant for Linux
    -q  [or --quiet]:      suppress warning messages
    You can override the detected geometry using:
    -C# [or --cylinders #]:set the number of cylinders to use
    -H# [or --heads #]:    set the number of heads to use
    -S# [or --sectors #]:  set the number of sectors to use
You can disable all consistency checking with:
    -f  [or --force]:      do what I say, even if it is stupid
Nokia-N900:~#