-) Step 1 : this scrip is an example to prune all logs and backup of a db.
#################### prune.sh
db2 connect to $1
db2 PRUNE HISTORY 20131007 AND DELETE
-) Step 2 : generate a command list to prune object for all Dbs in the instance
db2 list database directory | grep alias | awk ‘{print “./prune.sh ” $4}’ > cmdlist