The same way :-):

sp_MSForEachDb 'declare @LogFile nvarchar(2000)
                declare @ExeString nvarchar(2000)
                IF ''?'' NOT IN (''master'', ''tempdb'', ''model'', ''msdb'')
                   BEGIN
                      USE [?]
                      SELECT @LogFile = dbo.sysaltfiles.name
                             FROM master.dbo.sysdatabases
                      INNER JOIN dbo.sysaltfiles ON master.dbo.sysdatabases.dbid = dbo.sysaltfiles.dbid
                      WHERE (master.dbo.sysaltfiles.fileid = 1) AND (master.dbo.sysdatabases.name = ''?'')
                      ALTER DATABASE [?] SET RECOVERY SIMPLE
                      SET @ExeString = ''DBCC SHRINKFILE ('' + QUOTENAME(@LogFile) + '', 1)''
                      EXEC (@ExeString)
                    END'

Check for errors, because I wrote this directly here and didn't test it :-)