Suppose you want to change just one or a few attributes to the same value for all lists in an installation. You can do the following?
Put the desired setting(s) in a file. For this example, assume we want to set max_days_to_hold to 5 for all lists. Put this line
max_days_to_hold = 5
in a file.
For an overview of all settings, run
~mailman/bin/config_list -o - LISTNAME
for some LISTNAME.
Then run the following script
cd ~mailman for list in `bin/list_lists --bare` ; do bin/config_list -i /path/to/above/file $list done
for more information.