Udi asked,
I'm trying to summarize a folder by formail -l and I get strange
behavior.
formail -l doesn't summarize a folder; it outputs the same sort of
information about a message that woud be its log abstract in a procmail
logfile.
formail -l "some string here" < file_containing_a_message
or
process_that_outputs_message | formail -l "some string here"
gives you 'From ' and Subject: on the first two lines and then
Folder: some string here size
on the third line.
If you have an mbox as input,
formail -l "some string here" -s < mbox
also works, but there isn't much point to using the same string for each
message.
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