Thanks, era!
I think it'll be OK, if user separate it by comma. Can you give an example of arguments parsing in this case? Simply to grab all the ip-list to $1 with "case" and then go on it with "foreach"?
Although this can cause another problem with input like "1.1.1.1, 2.2.2.2", where there's whitespace after the comma. But I think there need be some limits for users' input errors and their prevention..If they don't want it working, don't let them touch it..
)
Thanks for CGI, I'll look at it.