echo Enter four integers with space between read a b c d sum=\`expr $a + $b + $c + $d\` avg=\`expr $sum / 4\` dec=\`expr $sum % 4\` dec=\`expr \\( $dec \\* 1000 \\) / 4\` product=\`expr $a \\* $b \\* $c \\* $d\` echo Sum=$sum echo Average=$avg.$dec echo Product=$product