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Update Shell.md

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Original file line number	Diff line number	Diff line change
`@@ -290,7 +290,7 @@ for i in ${array[@]};do echo $i ;done # 遍历数组,数组元素为空,没`
`290`	`290`	`a=3;b=3;`
`291`	`291`	val=`expr $a + $b`
`292`	`292`	`#输出:Total value : 6`
`293`		`-echo "Total value : $val`
	`293`	`+echo "Total value : $val"`
`294`	`294`	```
`295`	`295`
`296`	`296`

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