The linux fdisk program will do this. Check out the 't' command.
WARNING: Always double check everything twice before doing any operation with linux fdisk. The program does what you tell it to. If this isn't what you *meant* the consequences can be quite unpleasant.
"Joshua Shriver" <email@example.com> on 03/04/99 11:31:23 PM
cc: (bcc: Jonathan S Shapiro/Watson/IBM) Subject: EROS Installation
BTW what fdisk out there allows you to specify partition type? for using 0x95 or what the web page says.