Parted only runs under GNU/Linux and GNU/Hurd, at the moment. However, it can be used to resize partitions used by, or shared with other operating systems.
When you want to resize a file system, make sure it is not mounted. Parted can't resize mounted partitions (this may change in the future...).
If you modify the partition table on a disk with a partition mounted on it, you should reboot immediately. Linux won't know about the changes you made the partition table. (This will be fixed, with kernel 2.4, and when we add support for it.)
If you want to resize your root or boot partition, use a boot disk See section 1.6 Using a Parted Boot Disk, or use Andreas Dilger's online ext2 resizer, included in the ext2resize package section 6.2 GNU Parted and the Second Extended Filesystem.
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