Use wsadminlib's method save(). This method saves your changes and pushes them out to all the nodes immediately (if you are running in a cell environment). It also displays all the changes, for debug purposes.
Here is a screenshot from the end of an exercise where I created a new server:
wsadmin>save()
[2010-0301-1150-2400] save: AdminConfig.queryChanges()
[2010-0301-1150-2400] save: WASX7146I: The following configuration files contain unsaved changes:
[2010-0301-1150-2400] save: cells/ndcell/nodes/node1/servers/server1/server.xml
[2010-0301-1150-2400] save: AdminConfig.hasChanges()
[2010-0301-1150-2400] save: AdminConfig.getSaveMode()
[2010-0301-1150-2400] save: rollbackOnConflict
[2010-0301-1150-2400] save: AdminConfig.save()
[2010-0301-1150-2400] save: Save complete!
[2010-0301-1150-2500] wsadminlib.syncall Start
[2010-0301-1150-2500] wsadminlib.syncall Sync config to node node1
[2010-0301-1150-2600] wsadminlib.syncall Done
0
wsadmin>
