在网上找到的，发出来给大家看看。

Following are the steps to remove DB2 from Unix/Linux:

1.Remove DB[首先删除数据库]
(1)su - db2inst1
(2)db2 list db directory
(3)db2 drop db <db name>
2.Remove Instance【删除实例】
(1)su - root
(2)cd <db2 dir>/instance
(3)./db2ilist
(4)./db2idrop -f <instance name>
3.Remove das【删除das】
(1)su - root
(2)cd <db2 dir>/instance
(3)./daslist
(4)./dasdrop <das user>
4.Uninstall【卸载】
(1)su - root
(2)cd <db2 dir>/install
(3)./db2_deinstall -a
5.Remove user ( db2inst1,db2fenc1,dasusr1)【删除用户】
userdel -r <username>
please lookinto the file /etc/passwd before and after you deleted users