Alter DB modify log file for all DBs
You can generate a script to do that using dynamic TSQL and then run it

SET NOCOUNT ON;  
SELECT  'USE [MASTER] ' + CHAR(13) + 'ALTER DATABASE [' + d.name + N'] '
    + 'MODIFY FILE (NAME = N''' + mf.name + N''', FILEGROWTH = 10000 KB)'
    + CHAR(13) + CHAR(10) + CHAR(13) + CHAR(10)
FROM    sys.master_files mf
    JOIN sys.databases d ON mf.database_id = d.database_id
WHERE   d.database_id &gt; 1
    AND d.state_desc &lt;&gt; 'offline'
    AND mf.type_desc = 'LOG';


Original script from another answer here.