Log analyzer for log4j logs.

• -D : date filtering
• -T : time filtering
• -S : severity filtering
• -M : error messaga filtering

• -M has to be the last option, it can contain white spaces
• The order and the multiplicity of -D, -T, -S are irrelevant. The last one will be chosen.

• logan.sh -D2012-12-08 : it seeks all loglines with this match in date column
• logan.sh -D2012-12-* -SSEVERE : it seeks all lines in all days in Dec.2012. with SEVERE level
• logan.sh -D2012-12-* -D2012-12-08 : it takes all lines matching on 08.Dec.2012
• logan.sh -T12:*:* -D2012-12-* : it takes all lines matching on Dec.2012 between noon and 1PM
• logan.sh -MError message comes here : it seeks all lines matching on "Error message comes here"
• logan.sh -MError msg -D2012-12-12 : it seeks "Error msg -D2012-12-12"