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Arithmetic operation in Bash

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1：$(( ))

2：$[ ]

3：expr

C=`expr $A + $B`

4：bc

#!/bin/bash
x=1
y=2
echo $(( x + y ))
echo $[ $x + $y ]
echo `expr $x + $y`
let z=$x+$y
echo $z

bc <<< "scale=3; 11/15"

5：let

let C=$A+$B

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