Shell script provides only integer arithmetic operations (three ways)-((expression)), let "expression", value= ' expr Expression Right ' (reprinted)

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Numeric operations:

Only integer arithmetic is provided in bash, and the shell is implemented by the two commands of Let and expr .

Use the format: let "x= $x +1" or x= ' expr $x +1 '

Also, in the shell, it is possible to pass ((an expression)).

Use the format:((x= $x + 1))

In the above three ways, the operator can also be:

+ 、-、 *,/,%//add, subtract, multiply, divide, die

>>, <<, &, ^, | Right shift, left shift, bit and, bit counter, bit, or

?://Three mesh operator, same as C language.

The C-language supported operators, which are supported in the shell's integer operations.

Shell script provides only integer arithmetic operations (three ways)-((expression)), let "expression", value= ' expr Expression Right ' (reprinted)