Shell 之数学运算
# let x=88+99 && echo $x187
# let x=88*2 && echo $x
176
# let x=88-2 && echo $x
86
# let x=88/2 && echo $x
44
# let x=88 + 33 && echo $x
-bash: let: +: syntax error: operand expected (error token is "+")
# let "x=88 + 33" && echo $x
121
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