irc - How do I search in lists with irssi?

I would like to be able to search like this:

/window list | grep ruby

I have installed grep.pl to do so, but it still fails. The syntax says to do

/GREP [-i] [-w] [-v] [-F]  

But even typing /grep gives "Unknown command" in irssi.

What is a good way to find the number for specific channels? I keep on losing track of their numbers and typing /join #fullchannel name is often long and I often forget if the channel uses 1 or 2 #-symbols.

Answer

First off, make sure the script is loaded correctly by doing:

/script load grep

or

/script load autorun/grep

(if the grep.pl file is in your autorun directory)

Then, here is the proper command:

/grep ruby /window list