Merge-SPLogFile -Path C:\tmp\FarmLog.log
Merge-SPLogFile -Path C:\tmp\FarmLog.log -Correlation b572479c-ce57-10ce-c901-ce456a0284dc
Merge-SPLogFile -Path C:\tmp\FarmLog.log -StartTime "28.07.2013 00:00" -EndTime "28.07.2013 23:59"