IBM Data Server DB2 - Manual (Page 101)

Chapter 2. DB2 server deployment 87
On each target machine, you can use the db2ls command to list all of the
installed DB2 copies. Example 2-29 shows that our DB2 copy under /opt/IBM/
db2/V9.5 has been upgraded to fix pack 1.
Example 2-29 List the installed DB2 copies
# db2ls
Install Path Level Fix Pack Special Install Number
----------------------------------------------------------------------------
/opt/IBM/db2/V9.5 9.5.0.1 1