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#!/bin/sh

case $# in
0) echo "usage: tasks [ -open | -closed ]" ;;
esac

case $1 in

*open)

    gawk '
    /^TASK/             {task = $0}
    /^STATUS/ && $2~/[Oo]pen/   {print task; doprint=1}
    doprint
    /^-------/          {doprint=0}' TASKS

    ;;

*closed)
    gawk '
    $0~/^TASK/          {task = $0}
    $0~/^STATUS/ && $2~/[Cc]losed/  {print task; doprint=1}
    doprint
    /^-------/          {doprint=0}' TASKS

    ;;
esac