bin/calendar

PATH=/bin:/usr/bin
tmp=/tmp/cal$$
trap "rm $tmp; exit" 0 1 2 13 15
/usr/lib/calendar >$tmp
case $1 in
-)
        sed '
                s/\([^:]*\):.*:\(.*\):[^:]*$/y=\2 z=\1/
        ' /etc/passwd \
        | while read x
        do
                eval $x
                if test -r $y/calendar; then
                        egrep -f $tmp $y/calendar 2>/dev/null  | mail $z
                fi
        done;;
*)
        egrep -f $tmp calendar
esac