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# find assumes email files start with a number 1-9
# sed joins the lines starting with " " to the previous line
# gawk print the received and from lines
# sort according to the second field (received+from)
# uniq print the duplicated filename
# a message is viewed as duplicate if it is received at the same time as another message, and from the same person.
The command was intended to be run under cron. If run in a terminal, mutt can be used:
mutt -e "push otD~=xq" -f $folder
will find where myscript is, and then use vi to edit that file. Not much trick, but saves typing if you use it a lot.
The $(!!) will expand to the previous command output (by re-running the command), which becomes the parameter of the new command newcommand.