An email sorter
/usr/bin/sb_mailsort -t ham.mbox spam.mbox
|/usr/bin/sb_mailsort Maildir/ Mail/Spam/
/usr/bin/sb_mailsort -s message [message ...]
The full documentation for option is maintained as a Texinfo manual. If the info and option programs are properly installed at your site, the command
info option
should give you access to the complete manual.