-add folder1 ...
-add < single-message
The ADD resource instructs MHonArc to add messages to an existing archive. The archive specified does not exist, MHonArc will automatically create the archive. If input is coming from standard in, then the input is treated as a single message to add to the archive.
When adding, MHonArc will skip any messages that already exists in the archive. This allows one to have MHonArc rescan a mail folder only add any new messages found.
The following example shows adding a mail folder:
% mhonarc -outdir /home/ehood/mailarch -add inbox
The following shows how a single message can be added. The message comes from the output of the MH show program:
% show -noshow -noheader | mhonarc -add