a→c,b→c/all.do


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#!/bin/sh
redo-ifchange a b

read a <a
read b <b
read c <c

if [ $a -lt $c ]; then
  echo 'FAIL: a < c' >&2
else
  echo 'PASS: a > c' >&2
fi

if [ $b -lt $c ]; then
  echo 'FAIL: b < c' >&2
else
  echo 'PASS: b > c' >&2
fi