You're not going to find a single portable "unix" way of doing this. The format of /etc/fstab and /etc/mtab are pretty portable, but they only list mountable/mounted partitions, not all partitions.
In addition to the linux possibilities mentioned in another reply, there is also /proc/partitions. Finally, if you only want to recognize FDISK.EXE-type partitions (used by many types of Linux, though that seems to be changing in Fedora Core 4), it shouldn't be hard to write a Python program to read the partition table directly from the disk. The details will be readily available online. Jeff
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