Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/root/sys/src/cmd/upas/misc/gone.fishing

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Distributed under the MIT License.
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#!/bin/sh
PATH=/bin:/usr/bin
message=${1-/usr/lib/upas/gone.msg}
return=`sed '2,$s/^From[ 	]/>&/'|tee -a $HOME/gone.mail|sed -n '1s/^From[ 	]\([^ 	]*\)[ 	].*$/\1/p'`
echo '' >>$HOME/gone.mail
grep "^$return" $HOME/gone.addrs >/dev/null 2>/dev/null || {
	echo $return >>$HOME/gone.addrs
	mail $return < $message
}

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