Updated docs for filtering

README.md

@@ -5,16 +5,22 @@ A C# console application to parse log files (currently only Windows Perfmon form
 
 Meet Influxer, a small C# console application, which will take any generic csv file or standard PerfMon csv log, and upload it to any Influx instance.
 
+        Valid switches are
     -influx <url>       :   Influx DB Url
     -dbName <name>      :   Influx DB Name (will be created if not exists)
     -uname <username>   :   Influx DB User name
     -pass <password>    :   Influx DB Password
     -tags <tags>        :   Tags to be passed with every value, key value pairs, space will be converted to _
     -input <filename>   :   Input File CSV generated by PerfMon
-    -seperator <char>   :   Column Seperators default is ,
-    -timeformat <format>:   Timeformat used by PerfMon (default MM/dd/yyyy hh:mm:ss.fff)
+    -seperator <char>   :   Column Separators default is ,
+    -timeformat <format>:   Time format used by PerfMon (default MM/dd/yyyy hh:mm:ss.fff)
     -format <format>    :   CSV File format PerfMon(default) and Generic are supported. For generic TableName is required
     -table <table name> :   Influx Table name needed for generic format only
+    -filter <filter>    :   supported:measurement, field, columns.
+    -columns <columns>  :   Comma separated list of columns from input files
+    -filter-measurement or field is to restrict the input file to only measurements or fields that already present in the database
+    -filter-columns is to restrict to only few columns from the input irrespective of existing data in database
+    -columns will be ignored in other cases. Replace any inline commas in columns names with a space!
 
 In case of Perfmon logs, the measurements are created at a CounterObject level, and each counters in those objects become fields. The Host name is added as tag.