List all activities in a stream from command line

The activities in a stream can be viewed from within ClearCase Project Explorer:

The cleartool lsstream -long displays the activities from command line:

C:\>cleartool lsstream -long prj1_dev@\PVOB1
stream "prj1_dev"
31-Mar-06.19:44:07 by administrator.None@IBM-8D5F4F33A08
master replica: original@\PVOB1
owner: IBM-8D5F4F33A08\administrator
group: IBM-8D5F4F33A08\None
project: prj1@\PVOB1 (development stream)
default deliver stream: prj1_int@\PVOB1
development streams:
contains activities:
test1_24942@\PVOB1
rebase.prj1_dev.20060602.145948@\PVOB1
foundation baselines:
comp2_INITIAL@\PVOB1 (comp2@\PVOB1) (modifiable)
prj1_6_2_2006@\PVOB1 (comp1@\PVOB1) (modifiable)
recommended baselines:
views:
prj1_dev_vu
administrator_admin_prj1_snap
policies:
POLICY_DELIVER_REQUIRE_REBASE disabled
POLICY_DELIVER_NCO_DEVSTR disabled
...

To limit the output to only display activities:

M:\prj1_dev_vu>cleartool lsstream -fmt %[activities]p
test1_24942 rebase.prj1_dev.20060602.145948