Findstr

In computing, is a command in the command-line interpreters (shells) of Microsoft Windows and ReactOS. It is used to search for a specific text string in computer files.
Overview.
The command sends the specified lines to the standard output device.
It is similar to the codice_1 command. However, while the codice_1 command supports UTF-16, codice_3 does not. On the other hand, codice_3 supports regular expressions, which codice_1 does not.
The codice_3 program was first released as part of the Windows 2000 Resource Kit under the name codice_7.
codice_3 cannot search for null bytes commonly found in Unicode computer files.
Syntax.
 FINDSTR flags strings [drive:][path]filename[...]
Arguments:
Flags: 
Note:
Following command displays the detailed help about this command:
 FINDSTR /?
Example.
Save your running services into file _services.txt and search in this file for lines containing word "network" - case insensitive:
 @echo off
 set searchstr=network
 net start>_services.txt 
 FINDSTR /I "%searchstr%" _services.txt
 pause
output would be: 