Re: deleting all field headers except ...

Robert Brown asked,

| Is there a way to use formail to delete all field headers except a
| particular list of them?  I'd like to do something like:
| 
| $ formail -I "" -u From < foo

If you want to print out only one header (or a short specific list of
headers) and the body,

  formail -kX'From ' < foo

will preserve the From_ line and the body.

  formail -kXFrom < foo

will keep the body and every line from the head that starts with 'From':
i.e., the From_ line and the From: header.