/usr/share/doc/procmail/examples/1rmail is in procmail 3.22-25+deb9u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #!/bin/sh
#
# specify the mailbox file you want to read on the command line
#
MAILDIR=$HOME/Mail
cd $MAILDIR
LOCKFILE=$HOME/.lockmail
if lockfile -! -r1 $LOCKFILE
then
echo Mail is currently arriving, please wait...
while
lockfile -! -4 -r2 $LOCKFILE
do
echo Mail is still arriving...
done
fi
trap "rm -f $LOCKFILE;exit 0" 0 1 2 3 13 15
#
# Call your favourite mailer here.
#
/usr/ucb/mail -f $*
|