Multi-threaded checker of the content of a huge number of sites. Is there such a thing for Linux?

Question

linux

It is required to go through a huge list of sites and see if the line I need is found on the page. Is there such a thing for Linux? Or do you have to write it yourself?

Answer 1

Script using wget and grep?

Answer 2

You need to use a multi-threaded parser. Basically any language is suitable for this, but if you need simplicity and multithreading out of the box (tens of thousands of downloads in parallel), then Erlang will be indispensable.
I don't know of any resources. Maybe they can suggest more.

Answer 3

script for 10 lines
yes you have to write it yourself