If you are in Windows 7 then click the Start button and type cmd in Search programs and files textbox. If you are using Windows 8 then press the Windows Key and type cmd on the Start screen.
To see all the options, in the command, type find /?.
For example, to find the text “Action” in all the files in the current folder, type
find /c “Action” *.*
To find the text for example “Action” in a single file named “ProcessXmlMessage_quote.sql”, type
find /c “Action” ProcessXmlMessage_quote.sql