powershell - Why select-string doesnot receive from pipelining -


i trying parse out patterns file , search files strings group them. here code , error getting

ps d:\shared_with_pai\testing> get-content c:\\events.txt | select-string -pattern $_  * |select-object linenumber,filename|format-table -groupby filename select-string : cannot bind argument parameter 'pattern' because null. @ line:1 char:52 + get-content c:\\events.txt | select-string -pattern <<<<  $_  * |select-object linenumber,filename|format-table -groupby filename + categoryinfo          : invaliddata: (:) [select-string], parameterbindingvalidationexception + fullyqualifiederrorid : parameterargumentvalidationerrornullnotallowed,microsoft.powershell.commands.selectstrin gcommand

can making mistake?

edit: contents of events.txt like

8,coilevent,networkchange 8,coilevent,malfunction 8,coilevent,conflictwithpc

i searching csv files these lines.

the current object variable $_ isn't populated objects pipeline if use way. @kayasax suggested, need put statement in loop if want work that:

get-content c:\events.txt | % { select-string -pattern $_ * } | ...

however, there's no need read input pipeline in first place. -pattern accepts string array, can read file patterns in subexpression:

select-string -pattern (get-content 'c:\events.txt') * | ...

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