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/usr/share/doc/mailagent/examples/mhinc is in mailagent 1:3.1-81-4.

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#! /bin/sh
# @(#) incorporates mail in an mh folder from a mail/news folder

if test $# -eq 0; then
	exec inc
fi

if folder="$HOME/mail/$1" && test -s $folder; then
	:
elif folder="$HOME/news/$1" && test -s $folder; then
	:
else
	echo "mhinc: no mail to incorporate"
	exit 0
fi

if test -d $folder; then
	echo "mhinc: $folder is a directory!"
	exit 0
fi

echo "mhinc: using $folder"
inc +$1 -file $folder -truncate

# Do not leave zero-length files. This may lead to some trouble when
# saving news articles in them (trn will not recognize the "mailbox"
# format, which is required by inc).

if test -s $folder; then
	echo "mhinc: folder was not emptied"
else
	rm $folder
fi