In PowerShell, the equivalent of grep -f, which reads patterns from a file and searches for those patterns in another file, can be achieved using Select-String. To search for multiple patterns from a file, use:
This command reads each line from pattern_file.txt (containing the search patterns) and uses Select-String to search the target_file.txt. You can also use regular expressions for advanced matching, similar to grep. For a case-insensitive search, add the -CaseSensitive:$false flag.