Probably a faq, but not finding this action.
Summary:
Use procmail to start a script with out a pipe.
Something like this:
:0
* ^Subject: whatever-regexp
| sed '/find a certain line and print to file/' >FILE
Somehow start another program that does something with FILE. Like
insert its contents at LINE in a different file.
The second program doesn't use procmail input directly.
Probably can be done in the first call to a program but haven't figured
out how to do that either.
What I'm really after here is to take specific input from a mail
message and insert it into an existing web page.
maybe something like:
:0b
* ^Subject: REGEXP
|sed '/take this input and insert it in a webpage,saving the new page
to old name/'